On the simulated landscape of Mount Fuji within Jishi Island's barrier, the visible world fractured.
The moment both sorcerers completed their hand seals, their physical forms vanished. In their place, a perfect, fifty-meter sphere of absolute darkness manifested—Gojo's Unlimited Void, its event horizon a barrier of infinite information.
It lasted only a heartbeat.
From within the heart of that darkness, a violent, arterial crimson bloomed. It was not a light, but a structure—a colossal, multi-layered lotus forged of incandescent cursed energy, its petals like blades of crystallized flame. The Crimson Lotus Treasury Domain did not surround the black sphere; it erupted from its very center, Kamo's will shattering the void from within.
The lotus unfurled with a sound like tearing reality, its petals slamming against the inner wall of the black sphere. The conflict was immediate and visceral: a searing, metallic hiss as infinite data met absolute biological law. The lotus contracted, exerting a pressure that was not physical, but existential—the pressure of a defined, dominant reality against an all-consuming emptiness.
CRACK.
A spiderweb of brilliant light fissured across the black sphere's surface. Then—
BOOOOOOM—
The sphere of Unlimited Void shattered like glass. A shockwave of raw, conflicting domain-energy detonated outward, scouring the already devastated landscape into a deeper, wider crater of molten glass and dust. When it cleared, only the crimson lotus remained, gently pulsating at the crater's heart. Within its luminous core, the two sorcerers reappeared, standing face to face.
"It seems I have the edge this time, Satoru," Kamo said, a faint, satisfied smile on his lips. His domain held, a vibrant, living fortress.
"An open barrier domain…" Gojo breathed, his grin widening into something feral and ecstatic. "I knew it. With you around, I'll never be bored."
"You've lost the domain clash. Aren't you going to dismiss yours?" Gojo prodded, though his own cursed energy still churned violently.
"Don't try to trick me. You're not done," Kamo retorted, sensing the gathering storm within Gojo.
"Caught me," Gojo admitted with a shrug, but his eyes were alight with a mad scientist's gleam. "When my domain broke just now… I had a thought. A wonderful, terrible thought."
He met Kamo's gaze, his voice dropping to a conspiratorial whisper laced with manic excitement.
"What if I used Reverse Cursed Technique… to heal my Cursed Technique burnout?"
Before Kamo could process the sheer, paradigm-shattering insanity of the idea, Gojo's hands flew through the seals again.
Domain Expansion: Unlimited Void.
Another, slightly larger sphere of absolute blackness erupted, swallowing Kamo's crimson lotus whole.
Kamo's response was instantaneous, a reflex of sheer competitive will. From within the new void, an even grander, twelve-petaled lotus of fire and blood burst forth, its larger petals closing like a fist around Gojo's domain.
Another cataclysmic grind. Another shattering boom as the black sphere was crushed anew. The crater deepened, its walls glowing with residual heat.
Gojo reappeared, blood now trickling from his nose. His eyes, however, blazed with triumph and pain. "Again. Domain Expansion."
A third black sphere, larger still. A third crimson lotus, blooming to smother it. Crush. Shatter.
"Again! Unlimited Void!" Gojo commanded through gritted teeth, more blood streaming down his face. He was pushing his brain and soul past their designed limits, using Reverse Cursed Technique in a way it was never meant to be used—not to heal flesh, but to forcibly reboot a burnt-out metaphysical circuit.
Inside the observation bunker, the screens showed only the aftermath: the two men standing silently in the vast crater, the giant crimson lotus shimmering around them. It had been there for nearly a minute.
Ieiri Shoko frowned, tilting her head. "Shouldn't they be done? Why are they just… standing there?"
Geto Suguru's expression was grave, his knuckles white where they gripped the console. "They clashed domains. Kamo's won. That should be it…"
He had seen the black sphere appear and be consumed by the lotus. The victor was clear. Yet, the absolute stillness was more unnerving than any explosion. It was the stillness of a profound, invisible struggle—one happening at a speed and depth they could no longer perceive.
On the screen, Gojo Satoru suddenly took a shuddering breath. A fourth, terrifyingly vast sphere of utter blackness began to flicker around him, unstable and immense, before collapsing in on itself with a soundless implosion.
He swayed, then looked at Kamo, a ragged, bloody, and utterly exhilarated grin splitting his face.
"One more time," Gojo croaked, his voice raw. "I almost… almost have it."
He wasn't fighting Kamo anymore. He was fighting the fundamental laws of jujutsu itself. And from the look in Kamo Itsuki's eyes—a mix of alarm, deep respect, and dawning understanding—he was terrifyingly close to winning.
The observers in the bunker were left in a state of bewildered suspense. On their screens, the sequence had been clear: the black sphere appeared, was crushed by the crimson lotus, and then the two combatants fell motionless. Why the prolonged standoff? They didn't dare intervene, fearing to break some profound, invisible stalemate they couldn't perceive.
What they couldn't see was the war happening in micro-time, the repeated, catastrophic resets. Gojo Satoru had, in his own subjective battle-time, unleashed his domain five times.
The fourth attempt had just been effortlessly snuffed out by Kamo's ever-present lotus. Gojo's revolutionary technique—using Reverse Cursed Technique to forcibly heal his brain's Cursed Technique burnout—was a miracle of jujutsu innovation. It allowed him to bypass the fundamental cooldown of domain expansion, a feat thought impossible.
Yet, it wasn't enough. Every time his new domain—each one larger than the last—manifested, Kamo's Crimson Lotus Treasury Domain was already there, enveloping and crushing it from the outside with terrifying efficiency.
His fifth domain, now pushing two hundred meters in radius, bloomed into existence with a sound like tearing silk. It was a masterpiece of expanded scale and refined rule, a testament to his accelerating mastery under extreme pressure.
It lasted three seconds.
The crimson lotus, which had never dissipated, merely pulsed. Its twelve vast petals, shimmering with the light of a captive supernova, contracted once. The familiar, gut-wrenching hiss-crunch echoed through the crater, and the nascent black sphere of Unlimited Void imploded into scattered motes of cursed energy.
Gojo staggered, blood now freely flowing from his nose and the corners of his eyes. The strain of repeatedly burning out and regenerating his soul's connection to his technique was taking a visible toll. But his mind was a whirlwind of furious calculation.
"It doesn't make sense," he thought, his Six Eyes analyzing the aftermath. "I can adjust the barrier's parameters each time I rebuild, changing the size. But his domain… it's never gone. It's never been destroyed for him to recast it larger. So either…"
The realization hit him like a physical blow, cutting through the pain and exhilaration.
"...his domain was already this massive from the very beginning. Or it doesn't have a fixed size at all."
He looked across the smoldering pit at Kamo Itsuki, who stood calmly within the heart of his glowing lotus, its petals now stretching so far they seemed to brush the simulated horizon of the barrier. There was no strain on Kamo's face, only a deep, watchful focus.
Gojo Satoru wiped the blood from his lips, a slow, incredulous, and utterly thrilled laugh bubbling in his chest.
"An open barrier domain…" he whispered, then spoke louder, his voice raw but clear. "You didn't just make it without an outer shell to weaken it… you made it truly open. Its size isn't fixed by a barrier's cost. It's defined by… what? Your perception? Your cursed energy output at the moment of casting?"
He was reverse-engineering a fundamental breakthrough in real-time. Kamo's domain wasn't just strong; it was built on a completely different principle. It was less a constructed place and more an imposed state—a rule of reality that expanded to meet, and then overwhelm, any competing rule introduced within its sphere of influence.
The fifth domain had failed. The method of spamming domains was useless against a reality that refused to be bounded.
Gojo Satoru's manic grin returned, wider than ever. The pain was irrelevant. The loss was irrelevant.
He had just witnessed, and been defeated by, a new frontier.
"Okay, Itsuki," he said, straightening up, the flow of blood slowing as Reverse Cursed Technique stitched his micro-tears. "I yield on the domain front. That's your win."
He cracked his neck, the light in his Six Eyes shifting from the madness of repetition to the sharp clarity of a new strategy.
"But the fight isn't over. If I can't overwrite your world… I'll just have to shatter the one you're standing in."
His hands came together not in a domain seal, but in the beginning of a different, far more volatile sequence. The air around him began to churn with opposing forces—the deep pull of Blue and the violent repulsion of Red, starting to spiral around each other.
He was done testing. Now, he was going to break the simulation itself.