Four years passed in a haze of activities he started with his mother in the sunroom, her fingers dancing across the piano keys in a gentle, melancholic melody. He waited for her to finish, leaning against the doorframe. She had a plethora of instruments, from a piano to electric guitars, basses, and drum sets—exactly what you'd expect from an ex-musician.
He'd spent a year mastering the piano under her guidance, his Sharingan memorizing the sheet music and her finger placements with flawless accuracy. The true breakthrough came when he stopped seeing the music as data and started feeling it as emotion. He learned to pour his own quiet intensity into the sonatas, letting the notes carry the weight of a past life and the relief of a new one.
The following year, he tackled the guitars—all sorts: acoustic, classical, even ukulele—but his favorite by far was the electric guitar. The aggressive, wailing sound was a stark contrast to the piano's elegance. His mother, amused, showed him power chords and basic scales before he quickly outpaced her tutelage. He'd lock himself in the soundproofed music room, his Sharingan analyzing videos of legendary guitarists on a tablet. He could replicate Eddie Van Halen's solos note-for-note within a week, but it took months for the playing to stop sounding technically perfect yet emotionally hollow. He learned to let the distortion scream for him and to make the feedback wail with a frustration he rarely allowed himself to express.
He filled his third year with cooking. The kitchen became a new kind of dojo. Here, precision was measured in pinches and degrees, not milliseconds and millimeters. His Sharingan could track the exact moment a sauce reduced to the perfect consistency or the subtle color change in searing meat, but it couldn't teach him intuition. He learned that through failure: over-salted broths, rubbery omelets, and a spectacularly failed soufflé that became a family joke. The victory, when it came, was in the silent, contented smile on his father's face after a perfectly seasoned meal—a different kind of reward than mastering a new jutsu.
The fourth year was the most cathartic by far. He practically became a shut-in as he gamed the whole year, surrounded by decades of technological advances from people with intelligence-based quirks who designed games. Not to mention he had to see whether any games from his reality existed or if they were any different.
It was an archaeological dig into a future built upon the bones of his past. He plunged into virtual worlds crafted by minds boosted by intelligence quirks, experiencing genres and mechanics that would have been pure science fiction in his first life: hyper-realistic simulations, strategy games that required literal super-computing to play optimally, and VR experiences so immersive they blurred the line between reality and the digital realm.
But his true quest was more personal. He spent weeks scouring digital storefronts and dusty physical game shops in forgotten parts of Japan, searching for any echo, any ghost of the world he'd left behind.
The Quirk Era had seemingly erased the entire cultural bedrock of the 20th and early 21st centuries. It was a silent, profound extinction that no one else even knew had occurred.
The disappointment was a dull ache, a constant background hum of loneliness. He was, in a way, the last living relic of that time.
Then he found it.
It was in a cluttered, narrow shop that smelled of old hot dogs and dust, run by an elderly man with a Quirk that let his fingers interface directly with electronics. Tucked away in a bin of unsorted, disc-based games—a dead format—was a case. The cover art was faded, depicting a pixelated knight facing a monstrous, fanged beast under a crimson moon. "A fucking Souls game. Of course if anything survived."
Getting it to run required a museum piece of a console and a tangle of adapters, but he managed. The familiar, grim title screen loaded, the haunting, choir-driven music swelling through his speakers. It was like hearing a ghost.
For the next month, he did nothing else. He ignored his training, ate meals at his desk, and existed only in the bleak, punishing world of Souls games. He didn't use his Sharingan. He didn't use his enhanced reflexes. He played it straight, with the clumsy, desperate skill of the teenager he'd once been. He died—again and again and again—to low-level grunts, to trap-filled corridors, to bosses that seemed utterly insurmountable.
He threw controllers, cursed at the screen, and felt the same raw frustration he remembered. But he also felt a bizarre, profound sense of peace. This was a struggle he understood: a challenge that was finite, coded, and conquerable through sheer, stubborn perseverance. There were no world-ending threats, no mystical chakra, no hidden traumas. There was just a checkpoint, a boss, and the lesson to "git gud."
The final boss took him three solid days. When he finally landed the killing blow and watched the pixelated giant crumble into ash, a wave of catharsis washed over him so powerful it left him lightheaded. He hadn't just beaten a game; he had closed a loop. He had connected a thread across time, death, and reality itself.
To say he spiraled into the new world of games would be an understatement. He didn't just play games—he submerged himself in them. The pristine, sunlit rooms of the family estate became a warren of dimly lit caves, the glow of monitors his new sun and moon. Wires snaked across polished floors, connecting consoles of various eras into a chaotic, technological hydra. Empty ramen cups formed precarious towers on his desk, monuments to marathon sessions that blurred day into night.
His family watched this new obsession with a mixture of bewilderment and concern. To them, it was a bizarre and sudden shift from their intensely disciplined son to… this unkempt hermit. Despite that concern, his parents were happy he was at least acting his age, even if they worried about whether he was getting enough sun.
The fourth year neared its end, and Sen finally emerged. He didn't make a grand announcement. He simply joined the family for breakfast one morning, looking a bit pale but clear-eyed. He ate a full meal, listened to Rin and Ren chatter about their own middle-school ambitions, and helped clear the table.
The silence at the breakfast table was a comfortable one, filled with the clinking of cutlery and the soft morning light filtering through the large windows. Sen's return to routine was as understated as his departure into digital exile had been dramatic. He chewed his rice, listening to Rin animatedly describe a new technique she was developing with her light constructs while Ren debated the acoustic properties of the school gym for maximizing his Sonic Boom.
His mother, Hana, watched him over the rim of her coffee cup, her expression a careful neutral that didn't quite hide her relief. His father, Ken, cleared his throat.
"So," Ken began, his voice deliberately casual, "run out of games to beat?"
Sen looked up, meeting his father's gaze. A faint, almost imperceptible smile touched his lips. "Of course not. There's always games to play."
"And you'll play them all, I assume," Rin chimed in, grinning. "Your room looks like a museum for ancient technology."
"It's called a hobby, but I guess that's a hard word since you're like three." The comfortable breakfast chatter continued, a soft blanket of normalcy over the strange, intense year that had just passed. Sen's quip about hobbies earned him a mock-offended gasp from Rin and a snort from Ren.
His father, Ken, set his chopsticks down with a soft click. The casual demeanor shifted, replaced by the focused intensity of the retired pro hero Aegis. "A hobby's fine, son. More than fine. But a new one's starting soon, if you're still serious about it." He didn't need to say the name. UA hung in the air, a silent, weighty challenge.
Sen met his father's gaze, the faint smile gone, replaced by a familiar, focused calm—the look that had once made doctors and nurses uneasy in a newborn. "I am."
"Good," Ken said, a proud grin breaking through his serious expression. "The entrance exam is in two months. The practical, anyway. The written test should be a breeze for you. But you've been stagnant for a year. Are you sure you can manage the practical?"
The faint smile on Sen's face didn't waver. He placed his own chopsticks down neatly on the rest. The air in the room seemed to still, the playful energy from his siblings fading as they felt the shift in tone.
"Stagnant?" Sen repeated, his voice quiet but clear. He looked at his father, and for a moment Ken saw not his fifteen-year-old son but the unnervingly focused infant, the child who had stared down lightning and walked away with new eyes. "Is that what you think that year was?"
Ken leaned back, crossing his arms. It was what his kids called his "Aegis" posture, the one he used when assessing a situation. "You haven't set foot in the dojo in a year, Sen. Your training bands are collecting dust. You've been living in a digital world. From where I'm standing, that's the definition of stagnant for someone aiming for UA."
Rin and Ren exchanged a worried glance. Their father didn't often challenge Sen so directly.
Sen's response was not what any of them expected. "That sounds like a challenge. Are you sure your knees can handle it, old man?"
The challenge hung in the air, a gauntlet thrown not in anger but with a quiet, unnerving certainty. Ken's eyebrows shot up, a slow, competitive grin spreading across his face. The "old man" comment had done its job; it was a spark to the tinder of his hero's pride.
"My knees," he declared, pushing back from the table, "are going to introduce your 'hobby'-softened backside to the dojo floor. Right now."
Hana sighed, a long-suffering sound she'd perfected over years of living with two intensely driven males. "Must you do this right after breakfast? The digestion…"
But they were already gone, the sound of their retreating footsteps echoing down the hall. Rin and Ren scrambled after them, their breakfast forgotten, eyes wide with anticipation. A spar between their retired-pro-hero father and their mysteriously powerful brother was a rare and spectacular event.
The dojo floor, once a place of solitary perfection for Sen, now felt like an arena. The morning sun streamed through the high windows, illuminating dust motes dancing in the air stirred by their entrance. Ken stood at one end, rolling his shoulders, his retired-hero physique still imposing. At the other, Sen stood relaxed, his hands tucked into the pockets of his loose training pants. Rin and Ren sat seiza-style at the edge of the mat, trying and failing to contain their excitement.
"You sure about this, son?" Ken called out, adopting a classic, solid fighting stance. "A year is a long time to be away from fundamentals. Muscle memory fades."
Sen just smiled, a faint, knowing thing. "Some memories are deeper than muscle, old man."
Ken moved first. It was a testing strike, a quick jab meant to gauge distance and reaction speed. To his children, it was a blur. To Sen, it was a paragraph of information: the minute tension in his father's left shoulder before the right foot pivoted, the shift of weight, the exact trajectory of the fist. His Sharingan hadn't even activated. He'd spent a year not training his body but his mind. He'd honed his perception not on chakra flows but on frame-perfect input timing, on predicting AI patterns, on reading telegraphed animations in a dozen different game engines.
Ken's fist cut through the air, a textbook-perfect jab aimed at Sen's shoulder. It was fast—the speed of a seasoned pro—meant to test, to probe, to remind his son of the gap in their experience.
A year ago, Sen would have flowed around it with chakra-enhanced grace, a blur of motion that was itself a statement of power.
Today, he didn't move.
He didn't need to.
His head tilted a fraction of an inch to the right. The fist passed by his cheek, the displaced air rustling his silver hair. The movement was so minimal, so economically precise, it was unnerving. It wasn't the dodge of a fighter; it was the slight adjustment of someone avoiding a branch on a well-worn path they'd walked a thousand times.
Ken's eyes widened imperceptibly. He recovered instantly, flowing into a combination: a cross followed by a low kick aimed at sweeping Sen's legs. Each move was crisp, powerful, and—to Sen's newly calibrated perception—telegraphed.
Sen didn't block or counter. He simply… wasn't there. He took a single, small step back, letting the cross whiff by. As the kick came in, he shifted his weight onto his back foot, raising his front foot just enough for the sweeping leg to pass harmlessly beneath it. He didn't jump; he just adjusted his elevation.
It was like fighting a ghost.
Rin and Ren stared, their earlier excitement frozen into open-mouthed shock. This wasn't a spar. This was a demonstration.
Frustration began to bleed into Ken's movements. His attacks came faster, more complex. He feinted a jab, went for a takedown, then twisted into an elbow strike. It was a sequence that had pinned many villains.
Sen saw it all unfold not as a sequence of moves but as a single, interconnected pattern. The feint was a data point. The shift in hip alignment for the takedown was another. The elbow strike was the inevitable conclusion of the algorithm. He didn't react to the moves; he reacted to the intent behind the first feint.
He flowed through the assault like water around stones: a subtle lean here, a micro-step there. His hands never left his pockets. His expression remained one of calm observation.
"Alright, you're good at defending, but how's your offense?" Ken's question hung in the dojo, a challenge wrapped in paternal concern and a healthy dose of professional curiosity. The air, still thick with the tension of Sen's flawless evasion, seemed to tighten further.
Sen's faint smile didn't disappear. It simply… shifted. It became less knowing, more anticipatory. A hunter's smile. He finally withdrew his hands from his pockets, letting them hang loosely at his sides.
"Offense is just applied prediction," Sen said, his voice calm. "You just have to know where the opening will be before it appears."
He didn't adopt a stance. He just stood there, a picture of casual vulnerability. It was the most unnerving posture Ken had ever seen in a fight.
Ken, falling back on decades of experience, decided to press the advantage of his son's apparent passivity. He feinted high and lunged low, a classic maneuver to compromise balance.
Sen didn't try to stop the lunge. Instead, as Ken committed to the movement, Sen's left foot shot out. It wasn't a powerful kick. It was a precise, almost delicate tap against the inside of Ken's advancing ankle.
Ken's eyes flew wide with shock, not pain. His body, a well-trained machine, fought to correct itself, shifting his weight and leaving him off balance. That's when Sen grabbed his gi, swiping his foot against his father's ankle and using his own weight against him to throw him onto the floor.
Ken hit the tatami mats with a soft thud, the impact more shocking than painful. He lay there for a second, not from injury but from pure, unadulterated disbelief. The air rushed from his lungs in a stunned gasp. He hadn't been overpowered. He hadn't been outsped in a conventional sense. He'd been… dismantled. Like a novice who had overcommitted to a basic, telegraphed move.
Silence.
Rin and Ren were frozen, their earlier shock now replaced by something akin to awe. They had just watched their retired-pro-hero father—the man who could manipulate energy and had faced down city-level threats—be put on the floor by their brother, who hadn't even broken a sweat.
Sen stood over him, offering a hand. The faint, knowing smile was back, but there was no malice in it, only a quiet confidence. "Your center of gravity was too far forward after the feint."
Ken stared at the offered hand, the tatami mats imprinting a temporary pattern on his back. The silence in the dojo was absolute, broken only by the faint, awed whisper of Rin's breath. Then a low chuckle rumbled in Ken's chest, growing into a full-bellied laugh that echoed through the spacious room. He clasped Sen's hand, allowing his son to pull him to his feet with an ease that was, in itself, another quiet revelation of strength.
"Alright, alright," Ken said, brushing off his gi, a wide, incredulous grin plastered on his face. "Point taken. Stagnant was the wrong word." He clapped a heavy hand on Sen's shoulder, his silver eyes shining with a pride so fierce it was almost palpable. "What in the world were you doing in there all that time? Studying battle algorithms?"
"Something like that," Sen replied, the faint smile returning. His Sharingan had remained deactivated the entire time. The victory was sweeter without it. It proved the progress was his own, not just a gift from a past life.
After that, his mother practically ordered him to go outside. He didn't complain; he wanted to explore. He'd stayed home training most of the time since coming to this world, except when he had to go to school.
At the moment, he was strolling through the city. He had no idea where he was, but he was having a perfectly pleasant time. The city was a vibrant, chaotic tapestry of life, a stark contrast to the serene isolation of his family's estate. He watched people with all manner of quirks go about their days, a living, breathing spectacle that no game could ever truly replicate.
He spotted a familiar mop of green hair: Izuku Midoriya, the protagonist of MHA. Curiosity got the better of him, and he followed.
The sight of Izuku Midoriya in the flesh was a surreal jolt to Sen's system. Here was the heart of the story he'd only ever watched on a screen, a boy whose determination would one day shake the world.
His musings were cut short by a familiar, aggressive voice that grated in the air.
"Hey, Deku!"
Katsuki Bakugo swaggered into view, his two lackeys trailing behind him like pilot fish. His expression was a cocktail of contempt and boredom, instantly zeroing in on his favorite target.
"What the hell are you doing, scribbling in that stupid book again?" Bakugo snarled, snatching the notebook from Izuku's hands. Izuku flinched, a familiar panic flashing across his face.
"K-Kacchan! Give that back, please!"
Bakugo ignored him, flipping through the pages with a disgusted sneer. "Still analyzing everyone's quirks? As if you'll ever have one. You're just a useless, quirkless freak playing hero." With a casual flick of his wrist, he tossed the notebook over his shoulder.
"Yoink!" Sen caught the book, flipping through the pages. He had always wanted to see the whole thing instead of the few pages the show gave. "Whoa, this shit's super detailed."
Sen's voice cut through the tense air like a knife, casual and utterly unexpected. Bakugo's head snapped around, his sneer deepening into something truly venomous as he saw a stranger holding the notebook he'd just discarded.
"Who the hell are you?" Bakugo spat, his palms crackling with miniature explosions. "Give that back. It's worthless trash."
Izuku stared, wide-eyed, first at his saved notebook, then at the silver-haired boy who held it. He looked… completely at ease, flipping through the pages with genuine interest.
Sen ignored Bakugo for a moment longer, his eyes scanning a detailed analysis of a water-manipulation quirk. "Seriously, the torque calculations on the hydro-kinetic pressure… this is legit. You do all this just from watching the news?" He finally looked up, his gaze shifting from Izuku to Bakugo. His eyes, a calm silver, held no fear, only a mild, analytical curiosity. "And you called it trash? Your loss, I guess. I think it's pretty cool."
The sheer audacity of being ignored, then casually dismissed, made Bakugo see red. "I said," he growled, taking a threatening step forward, "who the hell are you?!"
"A guy who appreciates good data," Sen said, finally snapping the notebook shut with one hand. He held it out toward the frozen Izuku. "Here you go. You might want to back up your work digitally. Seems like it's at risk of… accidental loss."
Izuku mechanically reached out and took the notebook, his mind struggling to process this bizarre intervention.
The air crackled, thick with Bakugo's explosive rage and Izuku's palpable terror. Sen's calm intervention was a stone dropped into this volatile pond, and the ripples were not peaceful.
"Cool?" Bakugo's voice dropped to a low, dangerous decibel, the kind that promised immediate and violent retribution. The pops in his palms grew louder, more frequent. "You think some nerd's scribbles about heroes are cool? What, are you another useless extra dreaming about a quirk you'll never have?"
"I have a quirk, actually," Sen said, his tone conversational, as if discussing the weather. "But that's not the point. The point is, he," he gestured with his chin toward the still-paralyzed Izuku, "put in the work. He observed, he calculated, he documented. That's a skill. A useful one. Disrespecting it just makes you look insecure about your own."
It was the verbal equivalent of throwing a match into a powder keg.
Bakugo didn't scream. He didn't roar. He simply launched himself forward, a human missile propelled by a simultaneous blast from each palm. "DIE!"
As Bakugo closed the distance, his right fist pulled back for a devastating, explosion-enhanced punch, Sen took a single, precise step inside his reach. His left hand came up, not to block the fist but to gently guide Bakugo's swinging elbow, redirecting its momentum just enough to throw his entire center of balance off. At the same moment, Sen's right hand shot forward, two fingers extended. They didn't strike a muscle or a bone. They jabbed, with pinpoint, surgical precision, into a specific cluster of nerves on the inside of Bakugo's bicep.
It was a technique from his vast mental library: the Hyuga's Gentle Fist. He didn't have the Byakugan, but he didn't need it if he learned where the body's pressure points were.
Bakugo's roar of fury choked off into a sharp, startled gasp. The explosions in his palm sputtered and died as if doused with water. A violent, uncontrollable tremor wracked his entire right arm, his fingers splaying open uselessly. A wave of numbness, followed by a sharp, electric pain, radiated from the point of impact up to his shoulder. His charge faltered, his balance compromised by the sudden, total failure of his primary limb.
Sen didn't press the advantage. He didn't throw a punch or launch a counterattack. He simply took a single, graceful step back, putting a respectful distance between them. His hands returned to his pockets. The entire exchange had lasted less than a second.
The alley was plunged into a silence so profound it was deafening. The only sound was Bakugo's ragged, shocked breathing as he clutched his deadened arm, staring at Sen with wide, disbelieving eyes. The fury was still there, but it was now overshadowed by pure, unadulterated confusion. He hadn't been hit. He'd been… switched off.
Izuku stood frozen, his jaw hanging open. He had seen Kacchan charge. He had seen the explosion. He had braced for the impact. And then… nothing. The silver-haired boy had moved with a quiet, terrifying efficiency that made the explosive quirk seem clumsy and brutish.
"You telegraph a lot. Might wanna work on that if you plan on being a hero." Sen spun on his heel, placing his arm on Izuku's shoulder and leading him away from the fuming Bakugo. "What's your name?"
Sen's arm was a light, casual weight on Izuku's shoulder, yet it felt like an unbreakable tether pulling him away from the gravitational field of Kacchan's rage. He stumbled along for a few steps, his head whipping back and forth between the retreating form of the silver-haired boy and Bakugo, who was still clutching his numb arm, his face a spectacular portrait of shock, humiliation, and simmering, unspent fury.
"Wh-what? I—my name?" Izuku stammered, his brain finally rebooting with a jolt. "It's Izuku Midoriya! Thank you! That was—you just—his arm, how did you?!"
The words tumbled out in a frantic, breathless cascade. His analytical mind, usually so meticulous, was short-circuiting, trying and failing to process the event. He hadn't seen a quirk. There was no flash of light, no energy discharge. It was pure, impossible skill.
"Sen," the boy offered simply, not looking back as he guided them around a corner, finally putting them out of Bakugo's line of sight. He removed his arm from Izuku's shoulder. "And don't mention it. He looked like he needed a time-out."
"A time-out?" Izuku echoed. The phrase was so juvenile and dismissive it was almost funny. He'd just seen Kacchan, the most fearsome person in his entire world, neutralized like a misbehaving toddler. He finally got a good look at his rescuer. Sen was tall for his age, with an easy, relaxed posture that seemed completely at odds with what he'd just done. His silver hair was striking, and his eyes were a calm, observant gray. He looked… ordinary, in a way that made his actions even more extraordinary.
"Y-yes, well, thank you, Sen! That was really reckless of me. I shouldn't have been standing there, and you didn't have to get involved. Kacchan—he's—his quirk is really powerful, and he's going to be a great hero. He just—"
Izuku cut himself off, realizing he was already falling into his old habit of making excuses for his tormentor.
Sen watched the internal struggle play out on Midoriya's face with mild interest. "He's got a powerful quirk, sure. But power's useless if you can't control your own anger." He started walking again at a leisurely pace, and Izuku found himself automatically falling into step beside him, clutching his rescued notebook to his chest like a shield.
"Your analysis," Sen continued, nodding toward the book, "is good. Really good. You break down the mechanics, the applications, the limitations. Most people just see the flashy results."
Izuku's head snapped up, his embarrassment momentarily forgotten. No one had ever… understood his notebooks before. They were either mocked or ignored. "You… you really think so? It's just something I do…"
"Hey, Izuku, let's be friends." The words hung in the air between them, simple, direct, and utterly disarming. Izuku Midoriya stopped dead in his tracks, his brain screeching to a halt. His mouth opened and closed a few times, producing no sound. Friends? People didn't just… say that. Not to him. They especially didn't say it after witnessing the full, humiliating spectacle of his daily life with Kacchan.
"F-f-friends?" He finally squeaked out, his voice cracking. "With… with me?"
Sen turned to look at him, his head tilted slightly. The calm, silvery gaze was unnerving in its intensity. "Is there someone else here named Izuku I'm talking to?"
"N-no! It's just… why?" The question was out before Izuku could stop it, laden with years of confusion and rejection. "You saw what just happened. Kacchan… I'm… I'm quirkless." He said the last word in a hushed, ashamed whisper, as if admitting to a contagious disease.
Sen's expression didn't change. He didn't offer pity or performative sympathy. He just looked… thoughtful. "So?"
"So?!" Izuku's voice rose an octave. "Everyone… that's all that matters! Having a powerful quirk is everything if you want to be a hero! Without one, I'm just… I'm just a useless Deku!" The familiar, self-deprecating nickname slipped out, a shield he'd built from the insults hurled at him.
Sen was silent for a moment, watching the traffic pass by. Then he spoke, his voice quiet but firm. "You're sabotaging yourself with that kind of thinking. A quote from someone: 'No matter how you may be devastated by your own weakness or uselessness, set your heart ablaze. Grit your teeth and look straight ahead.'"
Sen's words landed not as a platitude but as a stone dropped into the still, deep water of Izuku's despair. The quote, spoken with a quiet conviction that felt ancient, echoed in the space between them. Izuku stared, his green eyes wide, the self-deprecating words dying on his lips. Grit your teeth and look straight ahead.
"Who… who said that?" Izuku whispered. The words felt heavier than any he'd ever analyzed in his notebooks.
"A hero," Sen said simply, a faint, almost imperceptible smile touching his lips. It was a smile that held a universe of unspoken stories. "A great one. He believed that the strength of your heart and the fire of your will were the truest powers anyone could have. A quirk…" Sen shrugged, the motion effortless. "A quirk is just a tool. A really cool, often flashy tool. But a hammer doesn't build a house. The person swinging it does. The words 'set your heart ablaze' mean to ignite your heart and will, turn it into an undimming fire that fuels your body."
The silence that followed was thicker than before, but now it was filled with something other than Izuku's shame. It was filled with the echo of those words: Set your heart ablaze. They seemed to hang in the air, shimmering with an almost tangible heat. Izuku's grip on his notebook tightened, his knuckles turning white. He looked down at the cover, at the hero name he'd scrawled across it with such hope, then back at Sen's calm, silver eyes.
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