Chapter: 1 - 3
The musty scent of old paper and dust hung heavy in the air. The overhead fluorescent lights buzzed in tired protest, casting a pale, flickering glow across the rows of aging bookshelves and outdated computer terminals. It was nearly closing time at the Ainsworth Public Library—a quiet little place tucked into the corner of downtown, forgotten by most and ignored by nearly all.
Roger Arley sat in the farthest corner, in a terminal seat wedged between a non-functioning printer and a cracked window that let in the occasional draft. His hands danced across the sticky keys of the computer, his focus absolute, his brow furrowed in concentration and irritation.
The glow of the screen lit up his angular face, pale from too many nights indoors. His hoodie was pulled low over unkempt brown hair, and a near-empty energy drink sat beside the mouse pad, warm and forgotten.
UserRArley94:
"You're all ignoring the most important thing. Shirou Emiya had potential. Unrealized potential, yeah, but potential all the same. Given the right foundation—real magecraft training, the right mentors, earlier exposure to circuits and theory—he could've become a top-tier magus. Easily."
His post hit the thread with a soft ding, quickly followed by the flood of replies that had come to define his evenings lately.
User473:
"He's a third-rate loser by design, bro. That's the point of his arc. He fails. Accept it."
SeventhWitch:
"Even if you shoved Zelretch's notes into his hands at age ten, he's still stuck with a busted origin and terrible circuits. You can't build a castle on rotten soil."
TypemoonSniper:
"Emiya exists to fail. His strength is ideological, not mechanical. You're missing the point of his character."
Roger clenched his jaw. He cracked his knuckles, then typed again.
UserRArley94:
"You all treat the Nasuverse like it's rigid canon law. But it's a system. A framework. Shirou never had a chance to build correctly—he got trauma, scraps, and trial by fire. That doesn't mean someone like him couldn't thrive under the right conditions."
He paused, staring at the blinking cursor. The argument wasn't just about Shirou anymore. It hadn't been for a while. For Roger, this was personal. He saw something in that stubborn redheaded idiot—something that mirrored his own sense of powerlessness. That burning need to do something, to leave some kind of mark on the world, even if it cost everything.
A final ding alerted him to another reply. Another dismissal. Another insult.
He sighed and leaned back in the creaking chair, rubbing at his eyes. He knew it was stupid to care this much. Just another online argument about a fictional world filled with impossible magic and doomed ideals.
But it mattered. It was one of the few things that did.
The library was almost empty now. A mother and her toddler packed up in the children's section. The old librarian behind the counter—Mr. Carlisle—had nodded off again, his wireframe glasses tilted on his nose. The silence stretched out, broken only by the low hum of the overhead lights and the whisper of wind outside.
Roger moved to log off.
Then the screen flickered.
Not a technical flicker, not like the dying monitor glitches he'd grown used to on this outdated system. This was… deliberate. Controlled. For a moment the screen went dark, then a new window opened, one he hadn't clicked.
A private message. No username. No profile picture. No timestamp.
Only the words:
"Are you willing to put your money where your mouth is?"
Roger blinked.
Beneath the message were two rectangular buttons, stark against the gray background.
[ YES ] [ NO ]
He stared at them, frowning. His first instinct was to scoff. This had to be a prank—maybe some forum troll, a mockup, a virus? But he hadn't downloaded anything. No links clicked. No suspicious files. And besides, the message had popped up inside the forum shell. Not a separate browser tab. It was in the code.
He glanced over his shoulder, half-expecting to see someone watching, maybe recording with a phone. Nothing. Just Mr. Carlisle still dozing and the mother's distant voice reading softly to her child.
Back to the screen.
There was a strange weight in the air now. Like the stillness before a storm. The kind of silence that wasn't empty, but full—charged with expectation.
His mouse hovered over [NO].
His finger twitched.
Then, slowly, he moved it to [YES].
Click.
The moment he selected it, the screen erupted into white. Not a gentle fade, not a graphic effect. Light—blinding and absolute—poured from the monitor like a wave crashing against the shore. His hands flew up to shield his face, too late.
A sharp, unnatural pressure stabbed into his temples, and the world around him dropped away.
"Wha—what is—?"
The sound caught in his throat as a wave of vertigo struck. The terminal chair beneath him vanished. The hum of the library. The flickering lights. The shelves. Gone.
All gone.
There was no wind, no falling sensation. Just light—so bright it became pain, then numbness, then nothing.
The last thing Roger saw before his vision dissolved completely was the blinking cursor frozen mid-screen, still beside that single question:
"Are you willing to put your money where your mouth is?"
And then—
Darkness.
His vision faded.
No sound.
No sensation.
No time.
No answers.
Only the void.
---
There was no sound. No sensation. No weight.
Just nothing.
Until—
Light.
It came slowly, seeping into the void like morning sunlight bleeding through blackout curtains. The oppressive absence lifted as colors returned in blurred streaks and shadows. Vision reassembled itself in disjointed fragments—first the ceiling, vaulted and ancient, then walls made of black stone veined with silver threads that pulsed like living arteries.
He blinked. Once. Twice.
The floor beneath him was cool and hard, cold enough to sting through fabric, laced with softly glowing sigils that hummed with latent power. Arcane circles. Geometric constructs of a language he didn't know but somehow felt. Lines and runes that vibrated against something deep inside him—something still asleep.
He sat up slowly, his limbs aching with phantom weight. His head swam with confusion as he stared at the alien room around him. Towering bookshelves loomed at the edges of his vision, stuffed with tomes older than nations. Worktables lined with half-finished magical devices—clockwork arms, bound crystals, inkwells filled with stardust. Candlelight flickered without flame, burning blue, green, and gold in ornate holders shaped like dragons, serpents, and birds with many eyes.
The air was thick with the scent of old parchment, iron, and ozone.
A laboratory. A sanctum. A place of impossible knowledge.
"What… the hell is this place?"
The words left his mouth like someone else's. His voice cracked—foreign to his ears, hollow like a whisper shouted across an empty canyon. A cold dread began to bloom in his chest as he tried to grab onto his memories—anything that could anchor him.
The forum.
The debate about Shirou.
The strange message.
The glowing screen.
The two buttons.
Yes.
He remembered all of that. Clear as day.
But when he reached deeper—tried to pull up something more personal—he found only void.
No name.
No face.
No birthday.
No parents.
No school.
No hometown.
No self.
Like someone had hollowed him out from the inside, wiped the canvas clean but left the frame standing.
His breath caught in his throat. A tremble overtook his hands.
"What's my name…?" he whispered, then again, louder this time. "What's my name?!"
Panic surged like a rising tide, suffocating and hot. His chest tightened, his vision tunneled, and the pressure inside his skull built until it was a scream. He gripped his head with both hands, rocking forward, a rising sob catching in his throat.
Then—
"Hmm. That won't do," a voice murmured behind him. Calm. Measured. Tinged with faint amusement.
The panic halted mid-surge, as though someone had flipped a switch inside his mind. A strange, unfamiliar tranquility fell over him like a warm blanket. The pressure evaporated. His muscles unclenched. His heartbeat slowed. The rising scream of terror dulled into a murmur, and then into nothing.
His emotional freefall became stillness.
He blinked, disoriented. The sudden shift left him mentally reeling, like emotional whiplash. He turned slowly toward the voice, his breath still uneven, heart thudding in his ears.
An old man stood behind him.
Tall and regal in bearing, draped in an elaborate cloak of deep crimson lined with gold threading that shimmered in the low light. His white hair was slicked back with effortless grace, and his beard was neatly trimmed, framing a face of patrician angles and aristocratic calm. His skin was pale, almost marble-like, as if he had stepped out of a Renaissance painting.
But it was his eyes that made the boy's breath catch in his throat.
Crimson. Deep. Timeless.
Not glowing, not unnatural—worse. They were utterly human in their shape and texture, and yet they held depths no man should ever see. Eyes that had watched empires rise and fall, seen parallel timelines splinter like glass, and walked away unchanged.
The moment he locked eyes with the man, knowledge surged from some unconscious place inside him.
He knew this man.
No name of his own. No past. But this name stood untouched, unshaken in his thoughts.
"Kischur Zelretch Schweinorg…" the words escaped in a whisper, almost reverent. "The Kaleidoscope."
Zelretch arched a brow, amused. "Excellent. Memory loss without intellectual decay. That saves us both a great deal of time."
He gestured to a nearby pair of chairs—ornate, carved from some dark wood that shimmered like obsidian, with high backs and deep red upholstery. One was already waiting. The other materialized behind Zelretch with a small ripple of air, like reality had been momentarily rewritten.
"Sit. You'll need your strength," the old magus said gently.
Still dazed, the young man obeyed. The chair was firm, but surprisingly comfortable, like it had been built to fit him specifically. He stared at Zelretch, who took the other seat with practiced ease, folding one leg over the other and steepling his fingers in his lap.
The silence stretched.
The boy opened his mouth, unsure where to begin. "What… what happened to me?"
Zelretch tilted his head, considering him for a moment. "That's a broad question. Shall I begin with metaphysics or narrative irony?"
The boy blinked.
A sigh. The old man leaned forward, voice soft but edged with centuries of certainty.
"You were a voice in the void, shouting into digital winds about possibility. You believed—passionately—that even a third-rate magus like Shirou Emiya could become something more… if only he had the right tools. The right guidance. The right environment."
Zelretch's eyes glinted with interest.
"Your conviction reached my ears. And conviction, my boy, is a currency rarer than any gemstone."
The boy swallowed. "So… you brought me here. Because of a forum post?"
Zelretch chuckled. "Hardly. I brought you here because you clicked yes. Because you were willing. That makes all the difference."
"But I didn't agree to… this." He gestured vaguely to the room, the arcane diagrams, the gnawing emptiness in his mind.
"You agreed to a wager," Zelretch said simply. "And wagers have stakes. Yours was memory. Identity. You've given up everything you were."
The boy clenched his fists. "But I didn't know—"
"You didn't need to," Zelretch cut in gently but firmly. "What matters now is what you will become. Your past is gone, yes. But not your knowledge. Not your instincts. That was the gift I gave in return: a clean slate… with one foot still planted on familiar soil."
The boy looked down at his hands. They were steady now. No tremors. The calm lingered like a soothing balm. But the absence inside him remained.
"No name… no self. Just a ghost in a borrowed world."
Zelretch's voice softened. "Then we must build you a new one."
Zelretch's crimson eyes gleamed with impish intent as he steepled his fingers and said, with maddening casualness, "To be more specific, you're going to be taking over the body of young Shirou Emiya."
The words hung in the air for several heartbeats, reverberating like a bell struck deep underwater.
The boy blinked, mouth slightly open. "…You're serious?"
"Completely." Zelretch smiled thinly. "I found a rather curious worldline. One in which the boy is pulled from the fire—just like canon—but the trauma he suffers in that cursed hellscape is… more severe. Fatally so, in a sense."
The boy leaned forward, a chill creeping up his spine. "He dies?"
"Not immediately," Zelretch said. "Physically, he survives. But his soul? Burned. Shattered. Reduced to little more than flickering remnants of consciousness. He doesn't wake. Doesn't speak. Doesn't react. No mind left behind the eyes. They admit him to a hospital, of course—Kiritsugu tries everything. But he flatlines within the week."
He paused meaningfully.
"A waste, really… and a perfect opening."
The boy's hands clenched against the armrests, knuckles white. "So… you want me to replace him."
"Not just replace," Zelretch corrected. "You'll inhabit that vessel. A clean slate. A body without a soul. You'll take over just before he dies. The transition will be seamless—no spiritual displacement, no divine backlash. To the rest of the world, you will be Shirou Emiya."
The boy looked down at the flickering sigils etched into the stone floor. "But I'll be me."
"In every way that matters," Zelretch replied smoothly. "You will have all he had—his incarnation status, his element and origin of sword, and all twenty-seven of his average-grade magic circuits. That body will be yours, completely. Identical to the Shirou you knew… but without the spiritual trauma that shaped his more self-destructive tendencies."
The boy glanced up, hesitant. "…So the only real difference is… I'll remember everything."
Zelretch smiled wider. "Exactly. You will carry over your so-called meta-knowledge—every fact, theory, contradiction, and fan-discussion you ever read about the Nasuverse. You'll know about magecraft structures, servant identities, the timeline of events. You'll remember weaknesses, strategies, hidden lore."
The boy exhaled slowly. The idea was terrifying… and electrifying.
"All that knowledge… and his magical potential," he muttered. "That's a hell of a combination."
Zelretch raised a finger. "Ah, but there's more."
He tapped the side of his head. "Unlike the original Shirou, you won't have that alien compulsion—that obsessive need to save everyone, even at the cost of yourself. No more blind idealism. No more suicidal altruism. You'll still care—but it'll be your decision, not an echo of another man's trauma."
The boy rubbed the back of his neck, absorbing every word. "And… his Reality Marble? Unlimited Blade Works?"
Zelretch nodded. "Still possible. You are, after all, assuming a body and soul tuned to the concept of sword. The potential is there. But it will not come to you the same way. You'll have to earn it. Build it. Internalize the concept through your own struggle. You'll forge the Reality Marble not as a mimic, but as an evolution."
The silence stretched between them for a moment, broken only by the distant ticking of some unseen chronometer.
The boy finally said, "All this… just because I clicked yes?"
Zelretch's smile faded slightly. His eyes softened, just a fraction.
"That… and the fact that you had nothing to stay for."
The boy's stomach twisted.
"You don't remember, but you were an orphan," Zelretch continued, voice low and steady. "No family. No close friends. Your academic record? Middling. Your future? Dim. You weren't suicidal, but you weren't living, either. Just drifting. Waiting for something. For someone to notice you."
The boy swallowed hard. His throat was dry.
"You were the perfect candidate," Zelretch said. "Clean departure. No cosmic balance to offset. No tears in your wake."
The boy's lips curled bitterly. "I see. So I was just… a piece on the board."
Zelretch raised an eyebrow. "Not just a piece. A subject. People like you—untethered, unremarkable, but aware—you make for the most fascinating experiments. The right push, and you either burn brilliantly or collapse spectacularly."
The boy's expression darkened. "I don't know how I feel about being called a subject."
The old mage shrugged. "It is what it is."
"…Charming."
A pause.
"So… wait," the boy asked, narrowing his eyes. "What about the you in that world? Won't he notice?"
Zelretch's face lit up with mischief. "Ah, now that's a good question."
He raised his hand, palm up, and conjured a three-dimensional lattice of worlds—orbital strands swirling in impossible geometries. The light they cast danced across the walls and shelves like shifting constellations.
"As the Kaleidoscope," Zelretch explained, "I exist across all worldlines simultaneously. There are infinite versions of me—some brilliant, some dull, some cruel, some kind."
He waved the image away.
"I am one of the greater versions. The Zelretch in the world you're heading to? A lesser one. He'll know something about you is… off. But he won't know why. Your meta-knowledge will be a black box to him. Something beyond the script."
The boy frowned. "Is that a good thing… or a bad thing?"
Zelretch laughed, deep and rich. "Yes."
The boy groaned and slumped back in the chair. "You're impossible."
Zelretch beamed. "I'm inevitable."
Another long moment passed.
"…I guess I don't have a choice, do I?" the boy muttered, voice laced with reluctant acceptance.
"On the contrary," Zelretch said, suddenly serious. "You made your choice the moment you clicked yes. All I've done is honor it."
The boy glanced down at his hands. "So… how does this work? Do you cast a ritual? Astral transfer? Is there a circle I have to stand in or—?"
Zelretch chuckled, standing up and dusting off his robes with exaggerated drama.
"No, no, nothing so dramatic. It's really quite simple, actually."
He leaned in, squinting at the boy's face with sudden, exaggerated scrutiny.
"Hmm… what's that there? Right on your cheek."
The boy blinked, confused. "What? On my face?"
Zelretch leaned closer. "Yes, just there. A little mark, maybe. A fleck—"
The boy raised a hand to touch his cheek. "What fleck?"
Zelretch's eyes lit up with boyish glee.
"MAH FIST."
CRACK.
The boy's head snapped back violently as the old man's knuckles connected with the force of a divine prank. Stars exploded across his vision. The entire room spun. His chair toppled over in slow motion, and he was falling, eyes rolling back, the last thing he heard being Zelretch's cackling laughter echoing off the vaulted stone walls.
And then—
Darkness.
---
The first thing he felt was weight—his own body pressing gently into the mattress beneath him, the coarse texture of hospital sheets against his skin. There was a dull throb in the back of his head, not painful, but persistent, like the ghost of something important just out of reach. Then came sound—soft beeping in measured intervals, the distant shuffle of feet in hallways, muffled voices beyond the door. A sterile, clinical scent filled his nostrils: bleach, plastic, overused air freshener trying and failing to mask the tang of antiseptic.
Light followed last.
His eyes opened slowly to a world of blank white ceilings and fluorescents that hummed with quiet menace. The ceiling tiles above were a pale grid, the kind found in every hospital, school, or institution meant to corral human suffering into neat, manageable boxes. Cold and impersonal.
It took several seconds before he remembered.
Zelretch… the deal. Shirou's body. The hospital. I'm alive… again.
He sat up.
Not all at once—his body protested slightly, stiff and slow like it had been asleep for far longer than it should have—but he moved. And it was his. He felt the tight tug of an IV in his arm, leads on his chest connecting to a nearby monitor, but there was no real weakness. He felt light. Nimble. Stronger than expected for someone who'd supposedly been comatose.
His gaze swept the room: a private room, sparse and functional. One bed. A table with a half-eaten apple on a tray. A TV mounted to the wall, muted. A single window with the curtains half-drawn, letting in the faint orange haze of late afternoon.
He swung his legs over the bed, the cold tile shocking against bare feet. He stood cautiously, testing his balance—steady. He reached up, brushed his hand through his hair, felt the unfamiliar coarseness of Shirou Emiya's unkempt red strands. It was still strange to think of it that way: his hair now.
On quiet feet, he padded across the room to the adjoining bathroom. The motion-activated light flicked on with a low buzz. A wide mirror hung above the sink, and he stared into it.
The face that stared back was young—much younger than he'd been before. Pale skin, still slightly sallow from bed rest. Red hair in disarray. Thin but defined features. And those eyes—a deep, burnished gold, like molten copper frozen mid-motion.
It was unmistakably Shirou Emiya.
He leaned closer. Studied every detail. He lifted his hand, turned it palm-up, rotated the wrist. He ran his fingers along his jaw, felt the smooth, unfamiliar contours.
This is me now.
There was no dissonance. No phantom limb syndrome. The body was his, truly and wholly. But it was still jarring. The old face—the one he'd once seen every morning in the mirror—was gone. Swallowed by fire, by magic, by Zelretch's wager.
Before he could lose himself further in thought, a sudden gasp broke the silence.
He turned sharply.
Standing in the open doorway to the room was a nurse in light blue scrubs, her hand still on the doorknob, a clipboard clutched to her chest. Her eyes were wide with disbelief.
"You—! You're awake?" she stammered.
He blinked. "Uh… yeah?"
The words came out more naturally than expected, though his voice was higher now—still that of a young boy. She blinked once, twice, then quickly set the clipboard aside and crossed the room in hurried strides.
"No, no, you shouldn't be up. Not yet. You were in a coma, young man. We… we didn't think you'd…"
She trailed off mid-sentence as she gently but firmly herded him back toward the bed, checking his IV line and leads with deft fingers, muttering something about vitals and miracle recoveries. He let her fuss. It was easier that way.
By the time she'd adjusted the sheets and confirmed everything was still connected, she gave him a tight, disbelieving smile and said, "I'm going to get the doctor."
She practically ran out of the room.
The next hour was a blur.
Doctors arrived in shifts. Some took vitals, others asked questions, still others simply stared at him like he was a ghost returned to flesh. The general consensus seemed to be amazement. No one could explain how a boy who had been unresponsive for days—no eye movement, no verbal activity, flat brain scans—was now awake, alert, and holding conversations.
He played the part well. Confused but polite. Cooperative. When they asked what he remembered, he gave them the same answer each time:
"Just my name. Shirou. That's all."
They wrote it down every time, like it was the key to unlocking some grand mystery.
Eventually, the medical staff trickled away. Some offered kind words. Some didn't know what to say at all. The light outside the window had faded to twilight, the sky painted in gentle pastels of indigo and gold.
And then the door opened again.
This time, it was him.
Kiritsugu Emiya.
He looked exactly as he had in the visual novel, the anime, the wiki images the boy had seen a hundred times before—but none of it prepared him for the sheer presence the man carried. There was something exhausted in his movements, a weight behind his eyes that spoke of things seen, done, regretted. He moved like a soldier between wars—ready for violence, but carrying only guilt.
He stopped just inside the door and stared.
For a moment, neither spoke.
Then Kiritsugu approached, pulled the room's lone chair up beside the bed, and sat. He didn't speak at first. Just looked at him with unreadable eyes.
Shirou, now truly in the role, offered a small, hesitant smile. "Hi."
Kiritsugu blinked. As if startled by the voice. It took him a second to respond.
"…Hi."
He shifted awkwardly, rubbing the back of his neck, clearly uncomfortable.
"So," he said at last, "the doctors tell me you… don't really remember anything."
Shirou nodded once. "Nothing but my name."
Kiritsugu exhaled slowly through his nose. "Just your first name, huh?"
Another nod.
"I… I wasn't sure if you'd ever wake up. They said you might not. But I didn't want to give up on you." He paused, gathering his words like fragile glass. "I filed adoption paperwork. I didn't know if you'd even survive, but I wanted… I wanted to make sure you weren't alone."
His hand clenched lightly in his lap.
"I know we've only just met. I'd understand if you didn't want to come with me, if you felt uncomfortable. I'm not… good at these things. But I want to do right by you."
Shirou stared at him, heart twisting.
This man—broken, awkward, tired—was supposed to be a killer. A monster. A man who had damned his own ideals for a chance at saving the world. But here he was, fumbling to offer warmth to a boy who wasn't even his own.
"I'd love to," Shirou said softly.
Kiritsugu looked up, startled. And then, slowly, a smile broke across his face—not a smirk, not a polite mask, but something rare and real. Something that looked like hope.
"…Thank you," he said.
He stood, walking to the door. "I'll finish the paperwork. We'll get out of here tomorrow. You can come home."
Shirou nodded. He felt something warm settle in his chest.
Kiritsugu paused with his hand on the doorknob. He looked back, a faint, wry smile on his face.
"Oh, by the way," he said casually, "I'm a magus."
And then he was gone, the door clicking softly behind him.
Shirou blinked. He stared at the empty doorway for several seconds.
"…He's way more awkward than I expected," he murmured, then chuckled.
But it was fine. He could work with this.
This was his new life. His new chance.
A new body. A new name. A new father.
And he was going to make the most of it.
---
The air inside the shed was still, heavy with expectation.
Twelve-year-old Shirou Emiya stood in the doorway, the rusted hinges groaning softly as he pulled it shut behind him. The quiet click of the latch was almost ceremonial—like sealing off the outside world to mark a moment that could never be taken back.
Dust floated in slanted rays of sunlight filtering through the small, grimy window high on the back wall. The shed, once nothing more than a toolshed filled with rusted scrap and long-forgotten implements, had over the past five years become something else entirely. A sanctuary. A forge. A laboratory. A war room.
His workshop.
Metal shelves lined the walls now, filled with carefully organized rows of reagents and materials: jars of chalk, powdered iron, containers of animal bone ash and sanctified salt, even small vials of his own blood, carefully drawn and preserved. His tools were precise, each one wrapped in cloth and placed deliberately: compasses, chisels, styluses, and small, hand-carved wands of oak and copper alloy. Books—some tattered, some bound in black leather—were stacked against one wall, annotated in his meticulous handwriting. Magecraft theories, ritual schematics, and breakdowns of alchemical components were pinned across cork boards like a detective's investigation map.
And at the center of the shed's floor was the culmination of months of design and days of labor.
A formal craft circle.
It spanned nearly the entire diameter of the room—an intricate series of nested arcs, angular glyphs, and looping sigils that formed a dense, tightly bound geometric array. The inner circle was laid in powdered copper and mercury bonded with anchoring agents. It shimmered faintly in the low light, almost breathing.
The outer ring was drawn in a thicker substance—his own blood, mixed with a stabilizing tincture to keep the lines sharp and the magic grounded. Interlocking paths between the two circles created a circuit of energy designed to redirect strain and prevent magical feedback. At twelve key points along the edges, small bone talismans sat wrapped in string soaked with a tiny measure of Shirou's prana.
He had spent an hour constructing it.
And then three more checking every inch. Every channel, every threshold, every containment rune. This wasn't a ritual he could afford to get wrong.
Standing at the edge of it now, he stared down in silence.
This wasn't some schoolboy's attempt at casting a spark. This was a structured working—real magecraft. The kind that could scar the soul or rupture nerves if miscast. The kind that either worked… or ruined you.
Shirou narrowed his eyes.
This is the threshold. It either moves me forward… or breaks me where I stand.
This ritual had only one purpose: to enhance his body.
He had designed it carefully, referencing scattered texts and obscure fragments of thaumaturgical theory, piecing together a working that was as elegant as it was ambitious.
It was dangerous. Experimental. Unapproved by any association worth its crest.
But it was his.
The room smelled faintly of copper and charcoal. The temperature had dropped slightly—a natural byproduct of the circle drawing in ambient energy. Static danced along the edges of his vision, and he could feel the spell array beginning to vibrate faintly at the edges of perception.
Good, he thought. That means it's holding.
He stepped closer, barefoot, the chalky tiles cool beneath his feet. The edge of the ritual brushed against his toes. He stood at the southern node—the designated entrance point—where the glyph of grounding had been inscribed in triple-looped spirals.
He walked to the center of the circle and sat cross-legged, placing the parchment at the nexus. His breathing slowed. His mind sharpened. He closed his eyes for a moment, feeling the energies gathered in the air around him—the building tension, the poised weight of the ritual waiting to fall into motion.
He rested his hands on his knees, fingers curled in practiced mudras, his posture still and precise.
50% chance of success, he reminded himself. As far as magecraft goes, that's generous.
His lips moved without sound, mouthing the first syllables of the invocation, and the circle answered—just slightly. A shimmer. A responding pulse in the copper lines. It was alive now. Waiting for the command to begin.
He didn't activate it.
Not yet.
Instead, he paused.
His eyes opened again and stared at the sigils beneath his feet, glowing faintly now like a slumbering beast stirring in anticipation.
The moment was here.
This was it.
The first true step.
The line between preparation and commitment.
And as Shirou sat in the dim light of the shed, at the heart of a ritual of his own design, about to take a step that would forever mark him as something other than human, something beyond an ordinary boy—he paused.
And thought.
He remembered pestering Kiritsugu almost daily after they'd left the hospital. The man had brought him home to the quiet estate on the outskirts of Fuyuki—a place that smelled faintly of dust, ashes, and something older. Shirou had been a model child for the first few days. Polite. Helpful. Quiet.
Then the questions began.
"Hey, Kiritsugu… you said you're a magus, right?"
"Can I see a spell? Just one?"
"Do you think I could learn it too?"
"I bet I could! You said I had potential, didn't you?"
"You do still use magecraft, right? You didn't stop?"
Every day, with the persistence of a child and the deliberate strategy of a tactician, Shirou planted the idea. He always stopped short of nagging—just curious, just enthusiastic enough to seem endearing instead of obsessive. He tailored his tone carefully, knowing how Kiritsugu thought. He didn't act like a boy obsessed with power. He acted like a boy fascinated by his father.
It took a month. Thirty long days of weaving the idea tighter into Kiritsugu's sense of guilt and paternal instinct.
Then, one rainy afternoon, Kiritsugu finally sighed and set a cup of coffee down on the table a little too hard.
"…Fine. I'll show you something. Just a little."
Victory.
The first lessons were primitive by magus standards. Abstract metaphors and incomplete explanations. Kiritsugu didn't talk about spiritual anatomy or thaumaturgical models. He talked about circuits as "wires" and prana as "current." He spoke of magecraft the way a mercenary might describe firearms—mechanical, practical, dangerous if misused.
But Shirou didn't mind. Because inside those half-formed ideas was the framework he needed.
One of the first lessons was about internal prana manipulation—how a magus channels energy through their nervous system to simulate magical circuits if theirs are underdeveloped or unopened. It was an archaic workaround, dangerous and inefficient, but it had given the original Shirou a foothold into magecraft. A fragile bridge where none existed.
Shirou, of course, already had circuits. Dormant, yes, but real. He understood the theory—because he'd read and re-read the details a hundred times in his past life. He knew how projection had nearly killed the original. How the act of brute-forcing activation had caused Shirou's body to deteriorate under strain.
He wasn't going to make the same mistake.
Instead, he used the technique differently.
He created a false circuit—not to sustain his magecraft like the original had done, but to ignite a chain reaction. He forced the fake channel into overload, using the sensory pain to push his soul closer to its spiritual threshold.
And then he let go.
The result was catastrophic… and successful.
He remembered the feeling—an eruption of pain that made breathing impossible, that lit every nerve in his body on fire. He remembered the scream—raw and primal—tearing from his throat as his body convulsed. He remembered collapsing to the floor, vision white-hot, body trembling as arcs of blue-white energy traced across his skin.
Glowing designs—not tattoos, not scars, but something deeper—etched themselves into his limbs in bright, geometric patterns. Momentary and ephemeral, like the glow of heated metal cooling into shadow.
Then darkness.
He woke up almost two days later.
Kiritsugu sat beside the bed with an unreadable expression on his face—one part relief, two parts awe, and something else Shirou couldn't quite place.
While Shirou had slept, the man had examined him. Not just physically, but mystically. Using his old tools—silver-thread diviners, crystal focus lenses, blood resonance readings. And what he found changed everything.
Twenty-seven circuits.
Natural, not grafted or inherited. The boy had twenty-seven average-quality magic circuits—Grade C by Clock Tower standards. Mediocre in quality. But the quantity? Exceptional for a first-generation magus. Most had ten or twenty at most.
And he had awakened them on his own.
Kiritsugu said nothing for a long time that day. But from that moment forward, something in his demeanor shifted.
He treated Shirou differently. Not quite as a peer—but as someone real. Someone serious.
A magus.
Training began in earnest after that.
The first discipline was Reinforcement—what Kiritsugu called the most fundamentally useful and fundamentally dangerous form of magecraft. Shirou took to it quickly. The idea of strengthening the weak—of fixing what was broken—resonated with him. Whether it was wood, metal, or flesh, he practiced until he could feel the weakness like a flaw beneath his skin.
Next was Alteration, the art of adjusting materials at a conceptual level—changing what something was without breaking it. Shirou began with softness and weight. He moved on to thermal properties. He once altered a piece of cheap steel until it was nearly as flexible as leather—and then returned it to rigidity without breaking it.
Then came Gradation Air—the manifestation of temporary objects. Kiritsugu could only barely manage it, but Shirou mastered the basics within weeks. His projections were fragile at first. Short-lived. Imperfect. But detailed. More detailed than they should have been.
Knives. Tools. A pair of broken pliers he'd once seen in a salvage yard. Every projection burned, every use drained him—but they came to him easier than expected.
He didn't mention that part to Kiritsugu.
But elemental magecraft?
That was where things unraveled.
Kiritsugu tried teaching him fire spells. Basic flame constructs. Then water shaping. Shirou tried everything—recitation, visualization, elemental catalysts. And every time, the spell either fizzled out or exploded in magical backlash.
His body rejected it.
It wasn't a matter of inefficiency or bad form. It was like trying to force two magnets together at the wrong polarity.
After several frustrating failures, Kiritsugu proposed a ritual to determine his Element and Origin.
They performed it beneath a waning moon. Incense, circle, focus point. Shirou sat at the center while Kiritsugu intoned the chant.
And then the incense smoke twisted.
It didn't form symbols. It didn't change color.
It formed a sword.
Simple. Plain. Brutal in its clarity.
Kiritsugu's lips pressed into a thin line.
When it was over, he told Shirou the truth.
That his Origin was sword. His Element… sword. A true incarnation of a singular concept.
He explained what this meant in the world of magecraft. How rare such things were. How the Clock Tower prized abnormalities—and how they assigned Sealing Designations to unique humans like Shirou, treating them not as people, but as specimens.
"They'd come for you," Kiritsugu said flatly. "Enforcers. Collars. Maybe even vivisection. You're too rare. Too valuable. They wouldn't leave you free."
Shirou nodded.
He'd already planned to keep it a secret, but for Kiritsugu's peace of mind, he promised again.
"I won't tell anyone. I understand."
From that moment on, their training changed again.
Kiritsugu began teaching him his skills. How to think like a killer. How to fight dirty. Knife combat. Movement drills. Gun theory—though they didn't have the weapons to practice with. He emphasized practical magecraft: Reinforcement in combat. Alteration for utility. Gradation Air for deception.
And Shirou absorbed it all.
Not because he wanted to become like Kiritsugu… but because he had to.
The War was coming. And he wouldn't face it as a boy clinging to ideals.
He would face it as a weapon sharpened in secret.
A blade hidden in plain sight.
---
The seasons shifted quietly over Fuyuki, the spring rains giving way to hot summer winds, then cooling again into the dusky gold of autumn. And through it all, Shirou trained.
Each day was regimented to the hour—morning conditioning, mid-day studies, evening magecraft. His muscles grew taut with use, his footwork sharpened, and his understanding of thaumaturgy deepened like a blade gradually honed against stone. Every scratch, every stumble, every scorch mark on his hands became a lesson.
Kiritsugu was merciless in his drills. "A second too slow, and you're dead." "Too much prana, and you'll detonate your own spell." "If it takes more than one motion, you've already lost." It was not the teaching style of a nurturing parent. It was the regimen of a soldier raising another.
Shirou never flinched from it.
Reinforcement and Alteration became second nature. He could now strengthen the structural integrity of a plank of wood well enough to let it support a car jack, and alter the surface of glass to scatter flame across it without shattering. These were not theoretical accomplishments—they were practical, battlefield-ready tools, and he knew it.
But it was Gradation Air that became his signature.
Kiritsugu had noticed it first.
"You're only projecting bladed weapons," he said one evening, after Shirou manifested a gladius so precise it could've been pulled from a Roman dig site.
Shirou looked at the shimmering copy as it slowly disintegrated into fading particles of prana.
"It's… instinct," he said quietly. "They just come to me. It feels right."
Kiritsugu frowned slightly, but said nothing.
After that, their training entered a new phase.
One night, Kiritsugu came home long after sunset, his coat damp from mist and his expression unreadable. He carried a canvas bag, thick with heavy objects. He walked past the kitchen, past Shirou seated in the main room reviewing reinforcement schematics, and dropped the bag onto the table with a dull thud.
Inside were books.
Old. Heavy. Worn with age. One was bound in cracked leather, another in fabric that felt like oilskin. There was even a stack of parchment scrolls with wax seals.
Shirou blinked, setting aside his notes. "What are these?"
Kiritsugu sat down across from him, stretching his shoulders with a faint grunt.
"New material. You're ready."
He pulled one book toward them and flipped it open. The page was filled with strange, angular symbols that seemed to shift subtly as the eye tried to focus on them.
"Rune Craft," he said. "One of the oldest disciplines still practiced today. These symbols predate civilization. They're more than just letters—they're commands embedded into the fabric of the world."
Shirou leaned in, eyes scanning the page.
"You don't cast them the same way you cast normal spells," Kiritsugu continued. "You inscribe them. Carve them. Paint them. Their meanings are fixed—already hardcoded into reality. All you do is choose the ones you want and fuel them with prana."
Shirou looked up. "And this doesn't rely on elemental alignment?"
Kiritsugu shook his head. "Not at all. Runes don't care who you are. They don't care what element you were born with or whether you have a family crest. They're tools. Ancient, brutal, reliable."
He tapped a rune for Ignition.
"Think of them like primitive magic circuits. You don't need to understand how the fire starts—just that it will, so long as you draw it right and feed it the right amount of prana."
He closed that book and reached for another.
"This," he said, lifting a tome bound in geometric silver filigree, "is Formal Craft. Modern. Scientific. A thousand years old, give or take. Built on ritual logic and alchemical theory."
He opened to a page filled with a complex array—four interlocking circles, inscribed with Latin text and anchored by runic nodes.
"It's like programming. You define the outcome—say, to increase air density in a given area—then create a structure to manifest that effect. You build a 'spell engine' out of geometry, incantation, and materials."
Shirou stared, fascinated. "So this doesn't depend on affinity either?"
"No," Kiritsugu confirmed. "Like runes, it's built on logic, not inheritance. The only things that matter are your understanding of the system and your ability to control prana flow through the structure."
He leaned back in his chair.
"Elemental magecraft has power, but it's restricted. These? These are disciplines that anyone can master, given enough effort."
Shirou nodded slowly, turning the page, fingers brushing over the faded ink. Each rune, each diagram, held a weight. A promise. This wasn't wild casting. This was architecture. And it was perfect for someone like him.
But after several minutes of quiet study, another question surfaced.
"Where… did you get these?" Shirou asked without looking up. "These aren't textbooks. Some of these look hand-scribed. This one has annotations in five languages."
Kiritsugu didn't answer at first.
He stared out the window for a long moment, the faint light of the moon casting shadows across his face.
"Called in a few old favors," he said finally.
Shirou looked up. "From who?"
Kiritsugu's gaze didn't waver from the darkened yard. "People I used to know. People I swore I'd never talk to again unless I had no other option."
A silence stretched between them.
Then he turned back, voice low but firm. "You don't need to know more than that."
Shirou nodded slowly. The answer was enough. More than enough, in fact. Because it meant that Kiritsugu—detached, haunted, prepared for the worst—believed in his potential enough to reopen doors long since closed.
That realization struck harder than any praise could have.
From that night onward, Shirou buried himself in his studies. Not just practicing, but memorizing.
He began with the fundamentals—runes of binding, ignition, weight, and motion. He learned to inscribe them properly—clean angles, steady hands, flawless proportions. He burned through dozens of wooden practice panels, carefully inking symbols before flooding them with prana and watching their effects. Some flashed with heat, others flared with light, and some simply hummed, releasing energy in subtle pulses.
He learned how to stabilize arrays with grounding runes. How to layer effects without rupture. How to cancel a circuit mid-cast by reversing current flow.
He moved on to Formal Craft with the reverence of a disciple. He memorized array structures, component hierarchies, and trigger phrasings in three languages. He practiced drawing full rituals from scratch: simple kinetic redirection, barrier constructs, motion activation arrays.
His shed became a library of failed experiments and successful templates. Every wall bore chalk diagrams, scribbled notes, cross-referenced translations. He wore fingerless gloves to hide the calluses from etching plates and gripping styluses. Every mistake, every misfire, every drained drop of prana was another notch in his mental blueprint.
And slowly, steadily, a truth began to emerge.
Shirou wasn't just learning magecraft.
He was constructing himself.
Discipline by discipline. Rune by rune. Ritual by ritual.
No mentors. No bloodline. No borrowed power.
Just understanding. Effort. And will.
---
The year that followed was no less demanding than the one before. If anything, it was more intense.
Shirou's days became defined by two things: application and refinement. No longer content with rote practice, Kiritsugu began engineering scenarios to test his son's spellwork under real stress—alteration cast mid-sprint, reinforcement done blindfolded, Gradation Air executed while dodging rubber bullets. Shirou endured it all.
And for the first time, runes and formal craft left the paper.
He carved runes into real objects—weapons, tools, talismans—layered them with prana and released their effects in live drills. He learned how to fuse runes into wood, bind them into metal, and paint them onto glass. The complexity of balancing prana flow into a functional seal while coordinating multiple triggers forced him to abandon sloppiness. His control improved. So did his patience.
He began designing hybrid matrices—ritual circles reinforced by binding runes that could stabilize larger formal arrays. Circles that wouldn't just cast magic, but hold spells in reserve like bottled lightning. And Kiritsugu, ever the watchful skeptic, observed with something between pride and concern.
Still, as Shirou advanced, his father grew more and more distracted.
Kiritsugu had been leaving home sporadically over the last six months—first for days, then sometimes for weeks. Shirou, of course, knew where he was going. Germany. To see Illya. To try, again and again, to bring her home.
But now the trips were stretching too long. Too unpredictable.
He couldn't leave Shirou alone anymore.
That was when he introduced Shirou to the Fujimura clan.
Shirou remembered their first meeting vividly. It took place in the garden behind the compound, where the stone lanterns flickered softly and sakura petals danced in the early spring breeze.
And she had come bounding toward him like a cannonball in a school uniform.
"KIRIIIIIIII-CHAAAAAAAAAN!! WHO'S THIS ADORABLE LITTLE THING?!"
Taiga Fujimura—wild, loud, and utterly uninhibited—practically tackled Shirou, squishing him against her chest with the force of a crashing wave. The boy stumbled under the impact, eyes wide, his ears ringing with her delighted squeals.
"He's so cute! Look at that face! This is illegal levels of cuteness! I'm keeping him! He's my little brother now!"
Her voice rang out through the house like a festival bell.
Knowing her from his past life's memories, Shirou simply went with it. Fighting her would only extend the drama. So, with a resigned sigh and a placid expression, he endured her suffocating affection and let himself be declared an honorary Fujimura on the spot.
That same day, he met her grandfather: Raiga Fujimura, the head of the clan.
A quiet man with sharp eyes and a gravelly voice, Raiga didn't speak much—but he watched everything. When Shirou bowed politely and introduced himself, Raiga gave a low grunt and offered a nod of approval.
It didn't take long for Shirou to become a familiar fixture around their estate. His habit of cooking, born half from practicality and half from need, turned into a point of admiration. Within weeks, he was preparing meals for both Taiga and Raiga on a near-daily basis.
And if his cooking was unusually good for a twelve-year-old?
Well, it wasn't entirely natural.
Shirou had learned early that Reinforcement and Alteration applied to food as well. The trick was subtlety—adjusting flavor balance at the molecular level, enhancing spice diffusion, even correcting texture imperfections.
The first time Kiritsugu caught him tracing a heat-resistance rune onto a cast iron skillet and layering a subtle gradation effect onto the rice to distribute steam perfectly, the man had blinked, stared, and—rarely—laughed.
"You're using magecraft for dinner?" he chuckled. "You're such a damn nerd."
Shirou had just smiled.
But all of that—training, cooking, the illusion of normalcy—fell into the background the day Kiritsugu left him in the Fujimura compound and boarded a flight to Germany alone.
And something changed.
That day, Raiga took Shirou to the Fuyuki Municipal Museum. It was supposed to be a cultural outing—a quiet afternoon, some appreciation for history.
But fate had other plans.
The exhibit was focused on Edo-period samurai weaponry, a dazzling collection of antique swords, armor, and relics. Shirou walked the halls in silence, hands behind his back, quietly memorizing the structure of every blade they passed. His eyes gleamed as he layered his gaze with magecraft—analyzing steel composition, resonance harmonics, forging techniques.
And then he saw it.
A single blade, displayed behind glass near the rear of the gallery. Unnamed. Untouched by war. Its placard simply read:
"Nameless Katana – Attributed to Sengo Muramasa, circa late 16th century. Recovered post-Meiji Restoration. Provenance: Opposition faction. Private donation."
The moment his eyes fell upon it, everything stopped.
The air around him changed. His circuits shivered. His blood stirred.
He stepped forward, drawn as if by gravity. His magic activated unconsciously—Structural Grasping snapping into place with a speed and clarity he had never experienced before.
And as his senses delved into the blade, the world sang.
It wasn't just steel. It wasn't just form. This was more than projection, more than sympathy. This was resonance. Like calling to like. The structural blueprint didn't just click—it harmonized. The shape of the blade echoed in his circuits. It reverberated in his bones.
And in that moment, everything made sense.
A fan theory, long debated in his past life, had suggested that Shirou Emiya's family might descend from Sengo Muramasa. But there had never been proof. Only hints. Shadows.
But standing there, staring at this sword…
He knew.
The connection wasn't just theoretical. His blood recognized this blade. His circuits aligned with it more easily than with anything he'd ever seen. It was more than his Incarnation as a Sword. It was lineage.
And with it, something else finally unlocked.
For months, he had been practicing the Seven Steps of Projection—those fundamental phases required for Shirou's tracing magic to manifest:
Judging the concept of creation.Hypothesizing the basic structure.Duplicating the composition material.Imitating the skill of its making.Sympathizing with the experience of its growth.Reproducing the accumulated years.Excelling every manufacturing process.But it never clicked.
Not fully. Not correctly.
Until now.
With this sword, everything aligned.
The clarity. The depth. The immediacy of understanding.
And it ignited something deep inside him.
He spent the next several weeks obsessively designing a new ritual—a hybrid system that combined runes and formal craft, using the resonance of this moment as its catalyst. His shed became a warzone of paper, chalk, incense, and scratched-out failures.
He barely ate. Barely slept. Kiritsugu had to force him to stop.
Eventually, after three straight days of nonstop work, Kiritsugu sat him down.
"You saw something at the museum," he said, voice calm. "I can tell. But what are you trying to do, Shirou?"
So Shirou told him.
He explained, using everything Kiritsugu had taught him about the Holy Grail War and Heroic Spirits.
He wasn't trying to summon a Servant. Not yet.
But he wanted to create a meeting point. A space between worlds. Using his own circuits as a base, and Imaginary Number Space as the medium, he would project himself inward while simultaneously drawing down a record—a fragment—of Sengo Muramasa's soul from the Throne.
Not to bind.
Not to command.
To speak.
A soul-to-soul communion—supported by his blood connection, reinforced through projection, and framed by a ritual construct he designed himself.
Kiritsugu was not happy.
He called it reckless. Dangerous. Unstable.
Shirou responded with the one truth he knew would land.
"To be a magus," he said, "is to walk with death."
Kiritsugu hated it. But he didn't deny it.
After that, he put Shirou through hell.
Surprise inspections. Pressure rituals. Night quizzes. Combat drills with incantation penalties. If Shirou couldn't replicate every symbol and every sequence on command, the ritual was postponed.
And Shirou met every challenge.
Finally, one misty morning, Kiritsugu entered the shed and handed Shirou a small black box.
Inside was a sliver of forged steel—irregular, dark, humming faintly with age and power.
"A fragment," Kiritsugu said. "From one of Muramasa's swords. An actual relic. Use it as a catalyst."
Shirou stared down at it, reverent.
Then he stepped into the circle.
The floor was covered in a massive matrix—formally designed, rune-reinforced, layered with spellweaving in four concentric rings. A sigil of three swords overlapped the central node. Each angle was measured, every junction triple-checked.
Shirou sat in the center, the steel shard resting in his lap.
He took a breath.
And opened all twenty-seven of his circuits.
The circle lit up in a heartbeat—glowing amber and crimson, every rune activating in sequence as his prana flowed into the system like molten fire.
This was it.
No turning back.
He had built a bridge to the divine.
And now—he would cross it.
---
When Shirou opened his eyes again, there was no pain.
No warmth, no cold.
No sound.
Just a still, perfect white.
An endless plane of light without source or direction. There was no horizon, no sun, no ground, and yet Shirou could sit, breathe, and exist. It was like floating in a blank canvas that extended infinitely, yet somehow it didn't feel oppressive. Instead, it felt… suspended. Like a breath held in the lungs of the world.
And he wasn't alone.
Seated directly across from him, knees tucked neatly beneath his frame in a formal seiza posture, was a man.
Older, but not ancient. His skin was lightly tanned, weathered by years under the sun, and though his features were plain and unassuming, they bore a quiet strength. He was bald, with a closely shaven scalp and a clean-shaven face, dressed in a pure white kimono whose folds looked like they'd never known a wrinkle. There were no crests or sigils on the garment. No symbols of honor. Only the silence of discipline.
But it was the eyes that arrested Shirou's attention.
Molten gold—deep, burning, luminous. The same shade Shirou had seen in the mirror every morning since the ritual. Except these were older. Heavier. And deeper. Like furnaces that had forged not only weapons, but burdens, regrets, and impossible dreams.
And then there were the hands.
Rough. Broad. Covered in old scars, burn marks, and the subtle discoloration of long-healed injuries. These were the hands of a man who had spent decades crafting, shaping, forging. The kind of hands that turned raw metal into divine weapons.
Those hands had touched history.
And now they rested, folded over a calm lap.
The man's lips curled into a half-smile, a dry laugh rumbling from his throat like the low crackle of an anvil fire.
"Well," he said, voice rich and weathered with age, "I never thought this would happen."
Shirou's eyes widened. "What do you mean?"
The man chuckled again, shaking his head. "I imagined a lot of endings for myself, boy. Maybe I'd fall into the cycle of reincarnation. Maybe I'd end up in hell for the number of cursed blades I hammered out. Or maybe I'd be forgotten entirely, my name eroded with time."
He gestured vaguely to the white world around them.
"But this? Being pulled from the Throne of Heroes—not fully summoned, not truly alive—just a shadow of my soul… all to have a conversation with my descendant? That wasn't one of the scenarios I expected."
Shirou blinked, his heart fluttering.
"...So I am your descendant?"
The old man gave him a sidelong glance, his golden eyes gleaming with amusement.
"You knew that already," he said with dry certainty. "You wouldn't have risked a spiritual ritual bordering on heresy if you weren't damn sure. You didn't come all this way just for confirmation."
Shirou smiled faintly. "I did. But it's different, hearing it from you."
The old man snorted. "Well, you've got my blood and my damn eyes. That's more than enough to prove it." He folded his arms. "So. You called me here. Why?"
Shirou's expression turned serious, contemplative.
"At first?" he said slowly, "I just wanted to meet you. I saw one of your swords—one without a name—and something inside me clicked. Like my magic and that blade were... singing the same tune."
He exhaled, letting the weight of his thoughts settle.
"But it didn't stop there. The more I trained, the more I studied, the more I felt this pull—like I had to meet the man behind the hammer. And when I realized I could? That I might actually be able to reach you?" He looked up, eyes burning. "I had to prove I was worthy of the legacy in my veins."
Muramasa—the name now undeniable—nodded slowly, a thoughtful look in his eye.
"Ambition for ambition's sake," he said after a moment. "A man after my own heart."
He leaned back slightly, raising a brow. "So. Which of my failures did you lay eyes on?"
Shirou smiled at the word "failure." Without replying, he closed his eyes, reached into the mental blueprint he'd memorized, and projected the nameless katana he had seen in the museum. It materialized in his hands—a perfect replication, its weight balanced, its lines precise.
He held it forward with reverence.
Muramasa took the blade, running his fingers gently along the spine, the edge, the subtle curvature of the kissaki. His gaze was sharp, methodical, dissecting the craftsmanship.
After a minute, he exhaled sharply and scoffed.
"I remember this one," he said flatly. "Decent blade. Not what I wanted. It fell short. So short, in fact, that I didn't even name it. Didn't deserve one."
Shirou hesitated. "It's considered a national treasure now."
That earned a full-bodied laugh from Muramasa. "This? A treasure? Bah! If I'd known the modern world would turn my scrap into legends, I'd have left something proper behind."
Still, despite his harsh words, his hands were gentle as he returned the blade.
Shirou smiled softly. "Even so. I think it's beautiful."
Muramasa looked at him, long and quiet. "Do you, now?"
He paused. Then, with the faintest trace of a smirk, he added, "I suppose I can understand that. It's not a bad sword. Just... not enough. I was always chasing something more."
His eyes darkened with memory, a flicker of failure crossing his brow.
"If I have one regret in life," he said, "it's that I never achieved my dream."
Shirou leaned forward. "What was it?"
Muramasa's gaze sharpened, a storm of conviction erupting behind those molten eyes.
"To forge a blade that could cut fate itself," he said, his voice quiet but thunderous. "A sword capable of turning aside karma. Of severing the chains that bind a man to destiny. A blade that could defy the gods themselves."
Shirou was entranced. In that moment, the void around them almost changed. The white expanse felt hotter. He could smell the forge. Hear the clang of hammer against steel. Feel the sheer will behind those words—the desire not to destroy, but to unmake and remake what the world decreed immutable.
Then Muramasa's gaze bore into him.
"And you, boy? What do you want?"
Shirou looked up, spine straight, eyes unwavering.
"I want to become a first-rate magus," he said. "I want to prove that legacy, bloodlines, circuits, even Origins—they don't decide who you are. I want to show that will, effort, and belief can push a man farther than what fate laid out for him. That anyone—even a faker—can become real through force of self."
Silence fell.
Then Muramasa laughed—louder than before. He threw his head back, voice ringing like bells of bronze, full of joy and pride and a touch of madness.
"Well, if I can be thankful for anything," he said at last, wiping his eye with a knuckle, "it's that my blood still runs strong."
He looked Shirou dead in the eye.
"Your dream may not be mine—but your fire? That's mine, alright."
Shirou dipped his head in gratitude. "Thank you… honored ancestor."
Muramasa's smile faded into a thoughtful frown.
"Our time is ending. I can feel this place breaking apart."
Shirou glanced around—and saw it.
The white void had begun to crack, like a glass dome under pressure. Threads of black were worming through the perfect whiteness, trembling like threads of fate snapping one by one.
"Gaia must be rejecting the ritual," Shirou murmured, more to himself than to Muramasa. "My projection into imaginary number space… it defies the natural order. The flow is reasserting itself."
Muramasa nodded solemnly.
"Then before we part, I'll give you something."
He extended one hand, pointing directly at Shirou's chest.
"Will you accept a gift, boy?"
Shirou nodded immediately. "I'd be honored, Great Master."
Muramasa closed his eyes briefly. "This ritual pulled data through the Grail system. Not a full summoning, but close enough to give me some context."
He opened his eyes.
"I understand that mage families can possess a Sorcery Trait. A rare gift—one that shapes their magecraft into something unique."
Shirou tilted his head. "Yes…"
"Then allow me," Muramasa said, "to forge one into you."
He pressed a single finger gently against Shirou's chest, just above the heart.
Warmth bloomed outward—pure, resonant, and harmonious. It wasn't hot, nor painful, but it wasn't passive either. It was alive. A humming vibration that danced through Shirou's blood, weaving itself into his circuits.
Muramasa stepped back, the edges of his form beginning to fray.
"It isn't much," he said, voice already echoing. "But I took what was already within you—and refined it. Tempered it. Forged it."
Shirou looked down at his chest, eyes wide. "What did you do?"
Muramasa's smile was like a rising sun.
"I've given you a Sorcery Trait. I call it... The Forge."
He spread his arms wide as the void fractured fully around them.
"It will grant you enhanced resonance with any magic tied to creation—Projection, Alteration, Reinforcement, Rune-craft, Formal Craft—anything that involves shaping the world with your will. Let your magecraft ring with the rhythm of the hammer. Let your prana flow like molten steel."
As his final words echoed into eternity, the white world shattered.
"Go forth, my descendant," Muramasa shouted. "And let no one—no god, no fate, no bloodline—ever douse your passionate flames!"
And then—
Shirou awoke in the shed, circuits glowing faintly, the warmth still in his chest, and the whisper of anvils in his ears.
---
Following his meeting with his ancestor in the depths of imaginary number space, the Emiya household changed.
It was subtle at first. Days still passed with the quiet rhythm of mundane life. Kiritsugu still made his periodic, solemn journeys to Germany—each one longer than the last, each one carrying the silent hope of bringing Ilya home. Shirou still split his time between self-training and the Fujimura clan, often dragged to family dinners or smothered in overly affectionate hugs from Taiga that left his ribs sore for hours.
But something had shifted.
The fire in Shirou had always burned hot, but now it blazed with focused intensity. And for once, Kiritsugu wasn't just an observer of that flame—he fed it.
Whether it was seeing his son come out of an invocation ritual—unscathed and smiling—or the subtle realization that time was running short for him, something inside the Magus Killer had stirred. He began taking Shirou's training more seriously. Not just in combat or the old tricks of assassination and fieldcraft—but in theory. He dug deeper into the dusty vaults of magecraft knowledge he'd long buried. Books on Nordic runes. Treatises on formal craft from Eastern European enclaves. Ancient rituals written in half-lost alchemic tongues.
And Shirou?
He devoured them.
His appetite for learning had grown ravenous. Each page sparked new ideas, each concept was a tool he could forge into something tangible. He no longer saw magecraft as a string of incantations, but as raw material—malleable, forgeable, something to be shaped through understanding and sheer will.
It was that mindset that led to the next great evolution.
Forging.
What had started as an idle curiosity—a craftsman's admiration for the swordsmiths he could trace and replicate—soon became a vocation in its own right. Shirou set aside a third of the shed he and Kiritsugu had long used as a workshop and converted it into a functioning forge. With Raiga Fujimura's help, he procured the tools he couldn't make himself: an anvil, bellows, a small smelting furnace, tongs, hammers, and steel stock of varying purities.
Within months, the once humble shed rang with the sound of steel meeting steel.
He began by imitating what he knew.
Through structural grasping and projection, he'd memorized the composition and construction of countless blades. Katana, Jian, gladii, falchions—his mind was a museum of weaponry, and he began trying to recreate them not through magic, but through sweat and muscle. At first, the results were crude. Imperfect tempering, flawed balance, ugly lines.
But with each failure, he learned.
He studied the skill behind the blades he admired. Felt their form resonate with his circuits, and from that resonance—he adapted. The smithing techniques he'd once glimpsed through projection slowly became a living language, and he grew fluent through practice.
Kiritsugu had once commented—half-joking, half-proud—that "blood rings true."
But Shirou only shook his head and replied, "Not blood. Dedication."
To that, Kiritsugu had simply nodded.
It was during this focused period of creation that Shirou found the solution to one of his most persistent limitations: elemental magecraft.
He had known from the start that he lacked natural aptitude in elemental alignment. His circuits rejected fire spells, ignored wind invocations, and produced water like sludge. But the answer had been sitting in his blood all along.
If he couldn't cast the elements...
...he would forge them.
Using a basic Jian pattern for ease of replication and balance, Shirou created a quartet of swords—one for each of the classical elements: fire, water, wind, and earth. Each blade was forged not just from steel, but layered with carefully inscribed runes and geometric constructs from formal craft. He embedded the glyphs into the very metal during the folding and tempering process—creating blades that weren't just weapons, but vessels.
Mystic Codes.
All he had to do was channel prana into one of the swords, and it would unleash the element it represented. A slash from the fire sword released a cutting wave of flame. The water sword could condense mist or launch high-pressure jets. The wind blade could manipulate trajectories or even create momentary pockets of flight. The earth sword? It could fortify barriers or turn the ground to spiked rubble with a touch.
When he demonstrated the fire blade to Kiritsugu, the man had stood silently, staring at the glowing runes dancing along the steel as a tongue of flame curved in the air like a dragon's breath.
After a long moment, he smiled.
"You just made your first Mystic Code," he said with quiet pride.
That moment—those few words—meant more to Shirou than any magical incantation.
And he didn't stop there.
Inspired by the Black Keys Kiritsugu had once shown him, Shirou began experimenting with binding swords. He modified lightweight stiletto-style weapons with rune patterns focused on gravity and kinetic arrest, creating blades that could pin limbs to surfaces or generate tangling feedback upon impact. Each design was refined through trial and error—some too weak, some too unstable—but eventually he developed a set of short swords that could bind even reinforced targets.
And as his knowledge deepened, so too did his innovations.
Drawing from both his cultural roots and magical studies, Shirou created a hybrid between eastern ofuda and western magecraft tags. His version—synthetic sutras—were paper talismans crafted with care, embedded with both runic language and formal craft arrays. They contained pre-written effects, activated upon contact or by a prana trigger. Some contained barrier wards. Others created flashbang-like distractions or short-range teleport anchors.
Each was a one-use mystic code, and while crafting them was time-consuming, they were devastatingly effective.
But the greatest breakthrough?
His projection.
Where others relied on incantation and theory, Shirou relied on experience—not just what he had read, but what he had lived. He had forged these weapons. Memorized them. Loved them.
His elemental swords? He could replicate them on the fly with almost no lag.
His binding weapons? The same.
Even his synthetic sutras—while slower than projecting steel—could now be conjured through sheer familiarity. He'd burned the runes and scripts into his mind so deeply that they were as natural to project as the swords in his soul.
He wasn't fast, not yet. And he wasn't subtle.
But he was effective.
Reinforcement ran through his limbs like a second pulse. Alteration enhanced his grip, his sight, his spatial intuition. Projection brought forth the tools he'd crafted. And when he fought now—be it against dummies, illusions, or even his father—he fought like a force of nature.
And still, every day, he trained. Every night, he read. Every week, he hammered out another blade or rune sequence. He was methodical. Obsessive.
Relentless.
A terror in the making.
And the forge inside him—both literal and metaphorical—burned brighter than ever.
---
The year that followed was a cavalcade of advancement—a time of furious growth in both body and mind for Shirou Emiya. His mastery of magecraft and combat expanded rapidly, driven not just by ambition, but by necessity. Kiritsugu, ever the watchful mentor, had begun to run out of material to teach. His personal libraries were exhausted, his combat techniques passed down in full, and yet Shirou's thirst for knowledge had only grown deeper.
Left to his own devices, Shirou turned inward and drew inspiration from the structural memories stored deep within him. The blades he had grasped in museums, the weapons he had projected and studied, each of them had carried echoes—shadows of the hands that had once wielded them. Through sheer will and projection, he began to replicate not just their forms, but their techniques. Swordsmanship styles from a dozen ages, wielders from across centuries—he absorbed them all, and through his own training adapted their methods to his body and circuits.
But he did not stop there.
From the discipline of swords, he moved into polearms—spears and halberds whose balance and reach taught him the intricacies of footwork and spacing. He turned daggers into tools of close combat efficiency, and even studied throwing knives, understanding the logic of movement and trajectory. Then came the bow.
The original Shirou had been an archer, and though this version of him had never stood on an archery range until recently, the moment he loosed his first arrow, something deep within him sang. It felt right.
And so he trained.
Day and night he practiced, drawing on his body's natural familiarity with projectile weapons and perfecting the balance between draw strength, aim, and breathing. His dedication paid off when he joined the Fuyuki archery club, quickly rising through its ranks. His skill with the bow became well-known among his peers, even if they didn't understand the true depth behind his technique. Each time he stood with bow in hand, it was as if part of him remembered futures yet to come—memories not his own guiding his posture, his breath, his release.
Outside of the workshop and the dojo, Shirou also began attending school regularly. It was here that he first met Sakura Matou.
They had crossed paths in the park, quite literally—Shirou coming across her being cornered and teased by a group of older children. Stepping in with calm authority, he dispersed the bullies with a glare and the firm voice of someone not afraid to stand up for others. He helped Sakura to her feet, brushing the dirt from her sleeves and offering a soft smile.
"Let's get you home," he had said. But instead, she ended up joining him for dinner.
That night, Kiritsugu sat him down after Sakura left and explained the Matou family's dark legacy—especially the shadow that was Zouken Matou. He warned Shirou not to get too involved, that it was dangerous.
Shirou nodded.
And made a silent promise to himself.
He would help Sakura, one day. He knew from his meta-knowledge that her situation was far worse than even Kiritsugu suspected. And if he couldn't intervene now, he would be ready when the time came.
From that day forward, Sakura became a regular face at the Emiya residence, often helping Shirou cook meals and laughing with Taiga over dinner. She felt like family. And Shirou never treated her with pity—only warmth. He showed her a world of calm and safety, of structure and patience, and slowly, she began to smile more often.
As for Rin Tohsaka, Shirou made it a point to steer clear.
He didn't fear her, not exactly—but he knew that her instincts were sharp. Too sharp. One slip, and she'd know he wasn't the Shirou she was expecting. Still, he found it hard not to get a rise out of her every once in a while. Subtle jabs during class. Quiet, knowing smiles that always made her scowl. It was petty, but fun. And besides, it kept her distracted.
And then came the project.
Shirou had noticed Kiritsugu slowing down. The man's movements were more labored, his expression more tired. The curse of Angra Mainyu was beginning to take its toll, eating away at the vitality of a man who had once walked the path of death without hesitation.
Shirou grieved, quietly.
But he also acted.
He wanted to show Kiritsugu that he was ready—that he could stand on his own, and that his father could rest in peace knowing that his legacy would live on in strength.
And so he began work on his first grand mystic code. No, not one—two.
The first was a bow. A compound bow made not from wood or carbon fiber, but from a revolutionary material: a graphene-metal alloy that Shirou had synthesized himself. Using formal craft and runes, he destabilized lab-grown diamonds into osmium and altered the density through layered rituals, creating a room-temperature stable supermetal.
It was a feat of alchemy and modern chemistry fused by magecraft—something that, though created through magical means, could one day exist through science. And so Gaia did not reject it.
The result was a bow of unmatched strength and flexibility. Runes were inscribed to amplify tension and absorb impact. A stabilizing formula was engraved into the limbs to prevent structural breakdown under magical reinforcement. The bowstring, made from a refined and altered form of the same alloy, could handle the strain of launching prana-suffused projectiles at lethal speeds.
This bow was not a weapon.
It was a declaration.
A promise to every enemy Shirou might one day face.
The second project was a full suit of armor. It took him ten days without pause. He began with the same graphene-metal alloy and shaped it into segmented plates—torso, limbs, joints, even boots and gloves. Each piece was overlaid with protection runes, comfort glyphs, and hexagramic formal craft arrays designed to establish a permanent bounded field around the armor.
The plating was thin enough to allow agility, yet durable enough to resist even high-level magecraft. Runes along the joints allowed for seamless motion, while prana conduits inscribed inside the plates allowed Shirou to channel energy through the armor as though it were a second skin.
When Shirou showed both mystic codes to Kiritsugu, the man simply nodded. He didn't speak for a long time.
Then he smiled, soft and proud.
"You're ready," he said.
Shirou tilted his head. "Ready for what?"
Kiritsugu walked over to a drawer and pulled out two thin, leather-bound books. He handed them to Shirou.
"Payment," he said simply. "From a job. Took down a rogue Atlas agent years ago. These were part of the reward."
Shirou glanced at the titles.
Memory Partition. Thought Acceleration.
He looked back at his father.
And smiled.
He was ready to become something more than even the original Shirou had dared to imagine.
---
The final stretch of time Shirou had with his father was a bittersweet interlude—a lull in the rising storm of his training, a breath drawn in the eye of fate. There was no escaping the truth that Kiritsugu's days were numbered. The curse that had slowly gnawed at him ever since the end of the Fourth Holy Grail War had begun to accelerate its pace. He moved slower. Slept longer. Ate less. Shirou could see it in the growing pallor of his skin, in the fatigue that tugged at his frame like a weight. Every now and then, Kiritsugu would stop mid-sentence, lost in thought or pain, staring into the distance with a hollow look in his eyes that spoke of battles long since ended.
And so, Shirou resolved to make every moment count.
His days were still a whirlwind of effort. He practiced tirelessly with memory partition and thought acceleration, testing the limits of his mind's processing speed and reaction timing. Each technique demanded more of his willpower and concentration, but the gains were undeniable. Every sensation, every moment of training, became sharper, clearer—the world unfolding to him with newfound precision.
Every moment not in school or the dojo was spent refining his magecraft. Projection, alteration, runic studies, structural analysis—he pushed himself beyond exhaustion, driven by the desire to be ready. To be enough.
But his evenings were different. His evenings were sacred.
Each night, as the cicadas chirped and the stars blinked overhead, Shirou and Kiritsugu would sit on the porch side by side. Sometimes they would talk, other times they would simply let the silence stretch between them, their breaths and the night air all they needed. There was an intimacy to those hours—a father and son joined not by blood but by shared resolve and fading time.
It was during one of these twilight hours that Kiritsugu finally spoke of the past he had carried in silence for so long.
He spoke of Irisviel von Einzbern, the beautiful and tragic woman who had given him hope in a broken world. Of Illyasviel, the daughter he had barely known, hidden behind the walls of the Einzbern estate, raised in cold isolation as a vessel for the Holy Grail.
His voice trembled as he spoke, not just from age or weakness but from regret—raw and aching. His hands clenched into fists on his lap. "I failed her," he said, his voice a husk. "I failed them both."
Shirou sat in stunned silence, the names from his meta-knowledge now given flesh and voice. He reached out, taking his father's hand gently in his own.
"Then I'll save her," he said softly. "I'll do whatever I can to help Illya."
Kiritsugu looked at him, eyes wide and tired. "I can't ask you to do that."
"You're not asking," Shirou replied, voice firm. "I'm telling you."
There was a pause, and then the ghost of a smile touched Kiritsugu's lips before his eyes drifted closed, the weight of the conversation pulling him into slumber.
The next morning, Shirou rose to find something strange.
His father was already awake.
These days, Kiritsugu rarely stirred before midmorning, often needing help just to move around. But today, he was up, dressed neatly in a dark cardigan and slacks, seated calmly on the porch. A small wooden box rested on his lap. The air felt different—not tense, not foreboding, but... final.
He looked up as Shirou stepped outside.
"Come," he said, voice steady. "Sit with me."
Shirou obeyed without question.
They sat in silence for several long moments, the soft rustle of leaves the only sound.
Then Kiritsugu spoke.
"I want to thank you."
Shirou blinked. "For what?"
"For saving me."
Shirou opened his mouth to respond, but Kiritsugu raised a hand.
"When I found you that night in the fire," he began, voice low and rough, "I was a man who had lost everything. I thought I had no right to keep going. But then there you were—crying, breathing, alive. You were hope made manifest. Somehow, you reminded me of what it meant to protect something again. To believe again."
He took a slow breath.
"And now... now you're strong. Stronger than I ever hoped you would be. Smarter. More disciplined. More principled. You've surpassed what I ever could have taught you."
He slid the wooden box toward Shirou.
"If you truly meant what you said last night about saving Illya, then I entrust this to you."
Shirou lifted the lid.
Inside was a sleek, well-maintained Thompson Contender pistol—a matte black weapon of simple yet refined design. It rested on a bed of blue velvet, accompanied by rows of glimmering .30-06 rounds, each inscribed with meticulous, shimmering runes. The aura that radiated from them was unmistakable: binding and severing.
"These bullets bear my dual origin," Kiritsugu explained. "Binding and Severing. They can cut through contracts, curses, and even spiritual bodies. I've already told you what they can do, and how dangerous they are. These are not toys, Shirou. They're tools—tools for killing, for ending."
Then, with a trembling hand, Kiritsugu reached into his cardigan pocket and withdrew a small, sealed envelope.
He laid it atop the pistol.
"I spent the night writing this. It's for your sister. Should you ever reach her... give this to her. No one else."
Shirou stared at the envelope, feeling the weight of the promise settle into his chest. He looked up, eyes shimmering.
Kiritsugu met his gaze. The unspoken truth lingered in the air between them. There wasn't much time left.
So Shirou said the only thing that mattered.
"I promise."
Kiritsugu closed his eyes with a soft sigh. Then, a faint smile. "Good. Now go. You'll be late for school."
And so Shirou went. He gathered his things. He walked the familiar streets. He went to school. He trained. He returned home. He cooked dinner, carefully seasoning every dish just the way Kiritsugu liked it.
That evening, as the cicadas resumed their chorus, Shirou joined his father on the porch. They sat together, side by side, as they always did. The stars above shimmered in the night sky like scattered jewels.
No words were needed. No promises left unspoken.
When the wind blew gently across the porch, ruffling Kiritsugu's silver-threaded hair, Shirou glanced to the side.
His father was still.
A serene smile lingered on his face.
And though his eyes were closed, there was a peace there Shirou had never seen before.
Kiritsugu Emiya had finally found his rest.
And Shirou, tears gathering in his golden eyes, whispered, "I'll keep going. I'll save her. I promise."
The stars blinked silently above.
The last gift had been given.
And the fire that would carry him forward burned brighter than ever.
---
The funeral was a subdued affair.
The sky had the decency to remain overcast, as if the heavens understood the gravity of the day. Clouds loomed thick and heavy, casting long shadows over the modest gathering that had come to pay their respects. A chill wind swept through the grounds, carrying with it the scent of incense, old flowers, and ash. It was not a large crowd—Kiritsugu Emiya had never been a man of the spotlight. He had moved through life in the shadows, a ghost among ghosts, and it was fitting that his sendoff was quiet, solemn.
Among the attendees was Issei Ryuudou, a friend Shirou had made at school—a sharp, principled boy with an austere demeanor and a good heart. He had offered a few comforting words before falling respectfully silent, his presence a calm and grounding one.
Sakura Matou was there too, quiet and withdrawn as always. Her hands were clasped in front of her, eyes red but dry. She had taken to visiting the Emiya household more and more frequently in recent months, often helping with meals or simply spending time in companionable silence. The loss clearly struck her hard, but she didn't speak of it. She simply stood by Shirou's side, a quiet pillar of support.
Of course, Taiga Fujimura was inconsolable. The "Tiger of Fuyuki" had all but collapsed at the cremation altar, clinging to Shirou like a sobbing elder sister, her tears soaking into his jacket. Her sobs echoed across the graveyard, filled with such raw emotion that even the stone lanterns and moss-covered statues seemed to mourn with her. Her grandfather, Raiga Fujimura, stood behind her, his expression unreadable beneath a veil of stoicism. Still, the old yakuza boss laid a comforting hand on Shirou's shoulder before they left, offering silent strength in his own way.
When the rites had concluded and the last ceremonial incense burned low, Shirou politely but firmly requested solitude.
No one argued. Not even Taiga. She sniffled but gave him a long, lingering hug before following the others away. Sakura lingered for a moment at the gate, as if unsure, her violet eyes flickering with worry. She opened her mouth as if to speak, but stopped herself, and finally turned to leave with one last glance over her shoulder.
Shirou watched them go before turning on his heel and heading to the shed.
The funeral was over.
But the real work had just begun.
