One constraint. Just one.
Jin had started at full power — the real Sukuna template, no weakened version, no degraded copy. If there was anything limiting him right now, it was purely physical: Naruto's body was six years old. Tiny. Under-developed. Built for running away from the other kids in the village, not for extended high-output combat.
The ninja world had a long tradition of sending children into the field, and Jin found that tradition at least logistically understandable. But even by those standards, six was pushing it. He needed at least a teenage body to fight comfortably. Something with actual reach. Actual muscle density.
And yet — switching bodies wasn't an option.
The chakra running through Naruto wasn't just the Nine-Tails. It was designated. Fate-stamped, in the particular way this universe ran its narrative machinery. One of only two Reincarnates in the entire world, and they were on a collision course with each other from birth. Naruto versus Sasuke. Ashura versus Indra. The cycle grinding forward exactly as it always had.
Wasteful to abandon that. Even if the body was inconveniently small.
I'll work with it for now.
"Now!"
The shout came from his left. He'd been standing still — barely a second, just long enough to let the thought finish — but to the Sealing Team watching him, that pause had looked like an opening.
Clatter.
Chakra chains erupted from the ground, multiple at once, racing toward him through the air with a sound like breaking ice.
Jin didn't move.
He let them come. Felt them wrap around his torso, his arms, his ankles, pulling taut. The chains were cold — the specific cold of compressed sealing chakra, dense and intentional — and they carried force, biting into the fabric of his control over the body.
Inwardly, he found them underwhelming.
You wanted to catch me with that speed?
He didn't dodge because there was no point in dodging. He wasn't worried about dying. Even in the unlikely event this body got killed, the Nine-Tails jinchuriki had built-in resurrection architecture. The Tailed Beast's immortality would simply scatter and reconstitute somewhere else. Death here was an inconvenience at worst.
"You actually think this is worth something?" the marked Naruto said, voice flat. "With your skill level — sealing a Tailed Beast?"
The surrounding Konoha ninja said nothing. A few of the less experienced ones visibly relaxed — we've got him — but the veterans traded sharp looks and said nothing, because they'd all noticed the same thing: he'd let himself be caught. He'd stopped moving and allowed the chains to take him.
That was not how something actually trying to escape behaved.
Doesn't matter. Start the seal.
The Sealing Team captain made the call with a quick hand gesture. No debate. Whatever this was, whatever it meant — the seal came first.
Chakra surged in unison. Hands moved through signs at a rate that blurred individual gestures into a single continuous motion.
"Eight Trigrams Sealing Style!"
Golden light detonated outward.
The sealing array crashed down over the marked Naruto like a wave, and Jin felt it immediately — the Nine-Tails chakra tightened inside the seal, pulled back, compressed. The wild, geological pressure of the Tailed Beast that had been bleeding into the air for the last hour suddenly went quiet.
Hmph.
The marked Naruto tilted his head up and looked at the Sealing Team with a slow grin.
"Not bad," he said. "Keep going. You're boring me — put some effort in."
The captain's expression clenched. He dropped to one knee, slammed both palms flat against the ground, and let his chakra explode outward.
"Nine-Tails! If you want to die, we'll grant it!"
The chains multiplied, tripled in diameter, lunging out from the earth like something alive — wrapping his limbs, his chest, dragging tight with golden-edged force. The light of the sealing array surged to a new peak. Jin felt the pressure spike hard against every part of the body he was using — movement was restricted, chakra flow was constricted, and the Nine-Tails reserves that had been so freely available a minute ago were now almost completely cut off.
He ran a quick internal assessment.
Nine-Tails chakra: sealed. Virtually inaccessible.
Sukuna's cursed energy: restricted. But only partially. The seal was built to contain a Tailed Beast — its framework had no concept of cursed techniques, no category for this type of energy, no architecture designed to block it. The sealing array was catching the Nine-Tails chakra perfectly and letting most of the cursed energy slip right through the gaps.
Exactly as expected.
The hypothesis confirmed, Jin's expression shifted — not frustration, but satisfaction. The kind that comes from a prediction landing correctly.
"Is this it?" the marked Naruto said, almost conversational. "This is what you use to manage Tailed Beasts? This is the system?"
"Break free from this if you can!" the captain shouted back, hands still moving through reinforcement seals.
Around the perimeter, the Konoha ninja allowed themselves a collective exhale. The monster was contained. The chains held. The array was active and feeding. It had been a brutal fight — especially brutal given that they couldn't actually hurt the jinchuriki — but it was over.
Hiruzen Sarutobi did not exhale.
His gaze was fixed on the marked Naruto with the focused stillness of a man doing math in his head and not liking the answer. His hands moved faster than the rest — faster than anyone else on the field, afterimages trailing each sign — and his chakra poured into the array in a continuous torrent that dwarfed everyone else's contribution.
"Reinforce the seal! Don't give it room to breathe!"
As a sealing master, he could confirm the technique was working. The Nine-Tails chakra signature was suppressed. The array was holding. By every metric available to him, this was a successful containment.
And yet.
Something was wrong. Something that had no name and no visible source, pressing against the back of his awareness like a sound just below the threshold of hearing.
Don't think. Move. Suppress it now, before—
"Nine-Tails, surrender!"
The cry came from a Sealing Team member, voice raw with strain. All around the marked Naruto, ninja pressed inward, feeding chakra into the array from every angle, the combined output turning the golden light so bright it threw shadows across the buildings three streets away. Even a small section of the sky above them seemed to dim slightly in contrast.
Hiruzen added more. More than he'd given already. Enough that the effort pulled at the deeper reserves, the ones he kept in the space between a lot and everything.
The marked Naruto felt it.
His body's freedom narrowed. The chains were everywhere now — limbs, torso, the movement of his fingers, even breathing was working slightly against resistance. Almost nothing in the body could move freely. The Nine-Tails instinct buried deep in the vessel was roaring — that old, prehistoric fury at being bound, at being contained, the howl of something that had been sealed for six years and still hadn't accepted it.
Jin noted this without much interest.
Because the cursed energy was still there. Restricted, yes. Pressed down by the sealing array to something like twenty percent output capacity. If the Konoha ninja kept reinforcing, that number might drop lower.
Which meant if he was going to do this, it needed to be now.
He looked up at the ring of strained faces around him — all the chakra, all the effort, all the genuine conviction that they had won — and he felt something warm move through his chest.
Not sentiment. Anticipation.
The chains were biting red marks into the skin. He let them. He pulled his arms inward, slowly, working against the resistance. The Sealing Team captain watched this movement with fresh alarm and immediately called for more chakra, more pressure, more—
Jin's hands came together.
The hand sign was unfamiliar to every ninja present — no element they could classify, no school they could trace it to. Hollow-palmed clasp, index and pinky closed, middle and ring fingers upright and pressed together.
The Enmaten seal.
"Domain Expansion—"
The whisper was quieter than anything else he'd said today.
"Malevolent Shrine."
Twenty percent.
That was all he had. The sealing array had done its job — it had cut his output to a fraction and was still actively pressing down. If this had been full power, every living thing within range would have been instantly and completely dismantled.
At twenty percent, it was merely catastrophic.
The skull of a giant beast materialized from nothing, vast and inevitable, swallowing the space around him whole. The ground split. The two-story structure rose from the earth like something that had always been there, waiting — perfectly symmetrical, mirror-balanced, tiles dark as charcoal, the support beams lacquered a deep vermilion. Its architecture was half shrine and half threat.
On every face of the building, worked into the main entrances and carved across the triangular gables of the roof, enormous mouths gaped open — each one filled with sharp, overlapping fangs, the darkness inside absolute, the red of the tongues vivid against it. Along the roofline and at every corner, curved white horns curved outward like the points of something predatory. The eaves were trimmed with demon-tile motifs. Every surface that could carry bone imagery did.
The sealing chains shattered.
Not weakened, not strained — shattered, all at once, the golden links snapping like thread as the Domain fully deployed.
And then the slashes began.
They were invisible and they were everywhere. They didn't announce themselves. They simply arrived, dense beyond counting, filling the space of the Domain with the absolute certainty of something that had been built to maximize casualties within its range.
Pfft. Pfft. Pfft. Pfft.
Every ninja caught inside the Domain's reach was hit simultaneously.
The ones with the worst luck went instantly — heads departing from shoulders, the results briefly and horrifyingly airborne before gravity caught up. The ones with stronger physiques survived the first wave with wounds that went to the bone, carved across torsos and limbs in multiple directions at once. The Sealing Team captain lost the use of both hands before he could form a single emergency sign, the slashes finding the precise tendons and joints with what felt like intention.
Flesh. Blood. Sound.
The sealing array didn't shatter so much as evaporate — the structure holding it together ripped apart from every direction at once, the golden light guttering and going dark in under a second.
The screaming started.
Hiruzen Sarutobi's voice cut above all of it. "No—!"
He came through the edge of the Domain with his clones flanking him, chakra still blazing at full output despite everything, staff raised — and what he saw when the slash-barrage passed and the air cleared made the word die in his throat.
The Sealing Team was down. Not all of them dead — he could hear breathing, labored and wet, from more than one direction — but none of them functional. The formation was gone. The array was gone. The chains were scrap on the ground.
Standing at the center of the Malevolent Shrine, no longer bound by anything, was the marked Naruto.
The black cursed markings on his skin had brightened. They moved now, shifting and flowing along his jaw and neck and arms like living ink, pulsing in a slow rhythm. The shrine architecture loomed behind him, its gaping mouths and curving horns catching what little light reached this part of the street. The whole picture was wrong in a way that bypassed rational analysis and went straight to something older.
Hiruzen stared at this six-year-old boy and felt the word demon arrive in his mind before he could stop it.
Not the Nine-Tails. Not a rampaging beast.
Something that had chosen to be exactly this, and was enjoying it.
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