Naruto: Kurotsuchi Mayuri

Night had already settled over the Nara compound, yet Kagetsu's room was still lit with a pale, steady glow from a single chakra-infused lamp.

The air carried a faint medicinal bitterness.

On the wooden table sat the larva.

Its body had grown once again compared to the afternoon, now thick and coiled like a half-formed serpent wrapped in a cocoon that refused to fully close. The surface of its skin pulsed rhythmically, as though something inside it was learning how to breathe in real time.

Kagetsu stared at it without blinking.

Orochimaru's visit had left no visible damage to the room, yet everything felt subtly altered.

Not fear.

Not pressure.

Something closer to contamination.

A presence that lingered in the molecular structure of memory itself.

The larva twitched.

Then, slowly, a thin dark vein appeared along its side.

Kagetsu leaned forward.

"Reaction to external high-grade toxin exposure… accelerated differentiation?"

He spoke softly, almost like testing a hypothesis.

The larva responded with a faint vibration, as if confirming it.

A translucent panel flickered in his vision.

[Unknown Larva – Evolution Trigger Detected]

Exposure Source: High-purity snake venom (Orochimaru-class biological signature)

Effect: Forced adaptive mutation

Status: Accelerating internal organ restructuring

Warning: Stability threshold decreasing

Kagetsu's eyes narrowed.

So it wasn't just poison.

It was Orochimaru's poison.

That changed the equation entirely.

He reached for a sealed vial placed beside the table. Inside was the sample Orochimaru had casually "gifted" during his visit—snake venom of unknown classification, extracted from a live strain that Kagetsu had never documented.

The liquid inside was dark green, almost black under light.

Just looking at it made the instinctive part of the brain hesitate.

Kagetsu uncorked it.

A sharp, metallic scent spread instantly.

The larva reacted violently.

Its body expanded in a single pulse, forcing the cocoon-like shell to split along fine cracks. The sound was soft but unmistakable, like fabric tearing under pressure.

Kagetsu did not move.

He simply observed.

"Still alive. Good. Then adaptation is not rejection-based but integration-based."

The larva's expansion slowed.

Then stabilized.

Its surface texture changed again—this time forming faint scale-like patterns, similar to reptilian skin, but not fully defined.

It was trying to become something that could withstand the venom.

Or something that could produce it.

Kagetsu made a note in his mind.

This was no longer simple cultivation.

It was forced evolutionary engineering.

A knock interrupted the silence.

"Kagetsu."

The voice came from outside the room.

Nara Shikakichi.

Kagetsu closed the vial calmly and covered the larva with a thin cloth infused with chakra suppression seals.

"Enter."

The door slid open.

Shikakichi stood there, arms crossed, his usual lazy posture replaced with something slightly more alert than normal.

His gaze immediately landed on the table.

Then the vial.

Then Kagetsu.

"You met him," Shikakichi said.

It wasn't a question.

Kagetsu nodded once. "Orochimaru-sama visited."

A long silence followed.

Shikakichi stepped inside slowly, closing the door behind him.

"That man doesn't 'visit' places without reason."

Kagetsu did not respond immediately. Instead, he adjusted the cloth over the larva.

"He is interested in biological adaptation systems. My research overlaps with his field of curiosity."

Shikakichi exhaled through his nose.

"That is exactly the problem."

Another pause.

Then, more quietly:

"What did he do to you?"

Kagetsu looked up.

"He did nothing."

A truthful answer.

But not a complete one.

Because something had changed.

Not Kagetsu's body.

Not his chakra.

But the direction of attention surrounding him.

Shikakichi stared at him for a long moment, then rubbed his temples.

"You are six years old and somehow managing to attract the attention of the most dangerous scientist in the village."

"I am aware."

"That is not reassuring."

Kagetsu tilted his head slightly.

"I believe it is beneficial."

"Beneficial?" Shikakichi repeated, voice rising slightly for the first time. "He is affiliated with experimental departments that even ANBU avoids discussing openly."

Kagetsu finally looked at him directly.

"Which makes him a valuable source of knowledge."

The room went silent again.

Shikakichi sighed heavily.

"…I am going to pretend I did not hear that."

He turned slightly, then stopped.

"But Kagetsu."

"Yes."

"If you ever feel like you are being observed too closely… by him or anyone else… you tell me immediately."

A brief pause.

Then Kagetsu answered.

"I understand."

Shikakichi left the room without further words.

The door closed.

Silence returned.

Kagetsu exhaled once, then turned back to the larva.

The cloth was moving slightly.

Not randomly.

Rhythmically.

Like breathing.

Far away, in a dimly lit laboratory beneath the streets of Konoha, Orochimaru stood before a glass container filled with faintly glowing liquid.

Beside him lay a small sample container.

Inside it—residual biological fragments taken from Kagetsu's larva during contact.

Orochimaru's fingers tapped lightly against the glass.

"This is interesting…"

His voice echoed softly in the empty room.

Behind him, a shadow moved.

A figure stepped forward silently.

White mask.

ANBU uniform.

But the chakra signature was wrong.

He was not ANBU.

He belonged to something deeper.

Something hidden beneath even the darkness of Konoha.

Orochimaru did not turn around.

"I assume this is not an official visit."

The masked figure spoke.

"Danzo-sama requests information."

A faint smile formed on Orochimaru's lips.

"So quickly."

The figure placed a sealed scroll on the table.

"In regard to the Nara child."

That finally made Orochimaru turn slightly.

His eyes gleamed with interest.

"So it has already reached his attention as well."

He picked up the scroll casually.

"He is very young."

The masked figure remained silent.

Orochimaru opened the scroll slowly.

Inside were fragmented reports.

Academy performance.

Battle observations.

Unusual insecticide development.

Shadow technique deviation analysis.

And a final line marked in red ink:

"Suspected high-value experimental talent."

Orochimaru chuckled softly.

"High-value…"

He rolled the word around like tasting it.

Then he closed the scroll.

"Tell Danzo…"

A pause.

"…that I am already aware."

The masked figure did not move.

Orochimaru's eyes narrowed slightly.

"But if he touches that child too early…"

His tone remained calm.

But the temperature in the room seemed to drop.

"…he may damage something far more interesting than he realizes."

The figure hesitated.

Then vanished.

Orochimaru was alone again.

He looked at the vial of Kagetsu's biological residue.

"Mayuri Kurotsuchi's influence… in this world…"

His smile widened slightly.

"How amusing."

The next morning.

Konoha Academy training grounds were loud again.

Children shouted.

Kunai clattered.

Explosions of basic jutsu echoed in controlled bursts.

But Kagetsu was not watching the chaos.

He was observing Kakashi.

Hatake Kakashi stood alone at the edge of the field, arms crossed, expression unchanged.

Nearby, Uchiha Obito was still visibly frustrated from their previous confrontation.

"You got lucky!" Obito shouted.

Kakashi did not respond.

Kagetsu noted the interaction silently.

"Emotional instability with high combat efficiency potential in Uchiha subject…"

He paused.

Then corrected himself internally.

"No. Not relevant to current experiment."

His attention shifted.

Something else had caught his interest.

Kakashi's chakra flow.

It was unusually refined.

Too efficient for a child.

Almost surgical.

Kagetsu narrowed his eyes slightly.

"If refined control is paired with early exposure to lethal combat scenarios…"

He stopped again.

A familiar sensation surfaced.

That intrusive analytical impulse.

The one that did not belong to him.

But to the Mayuri-derived talent embedded within his system.

He exhaled slowly and suppressed it.

"Observation only."

A bell rang.

Practical assessment continuation.

Students were ordered into pairs.

Kagetsu remained uninvolved for the moment.

But he felt it.

Eyes.

Not from classmates.

Not from teachers.

From above.

High observation point.

Chakra presence concealed but not absent.

ANBU.

Or something similar.

He did not look up.

Instead, he smiled faintly.

"So it has already begun."

In the Hokage Tower, Sarutobi Hiruzen stood at the window, pipe in hand.

Below, the academy grounds were visible.

He had been watching for some time.

Beside him, a report lay open.

Orochimaru's visit to the Nara compound.

He exhaled smoke slowly.

"First Orochimaru…"

Then his eyes moved slightly.

"…and Danzo is already circling again."

A quiet sigh.

"This generation is becoming troublesome earlier than expected."

His gaze settled on Kagetsu in the distance.

The boy was not fighting.

Not speaking.

Just observing.

Thinking.

Calculating.

Hiruzen narrowed his eyes slightly.

"Too analytical for his age…"

He paused.

Then added softly.

"Or perhaps… exactly what the Nara clan produces when guided too far in one direction."

A knock interrupted him.

An ANBU operative appeared.

"Hokage-sama."

"Report."

"The subject Kagetsu has been observed by Root agents."

Silence.

Hiruzen did not move for a moment.

Then he exhaled again.

"I see."

He turned slightly.

"Do not interfere yet. Observe only."

"Yes, sir."

The ANBU vanished.

Hiruzen looked back out the window.

"…Orochimaru is interested. Danzo is interested."

He tapped his pipe once.

"That is not a coincidence."

Back at the academy.

Kagetsu was now in a controlled sparring match against a civilian student.

It ended in seconds.

Shadow immobilization.

Clean restraint.

No damage.

Efficient.

Boring.

Kagetsu stepped back, expression unchanged.

But internally, he was processing something else.

The larva.

Its evolution had not stabilized overnight.

Instead, it had entered a cocoon-like state.

And within it…

Something was changing.

Rapidly.

Too rapidly.

He could feel it faintly through chakra resonance.

A second heartbeat.

Then a third.

Multiplication trait expression confirmed.

Kagetsu's eyes narrowed slightly.

"So it was hidden."

A quiet breath.

"This is no longer a single organism."

He looked toward the sky.

Somewhere beyond the academy walls, far deeper than ordinary perception range…

He felt it again.

That same observation.

But stronger.

Focused.

Intentional.

Not Hiruzen.

Not ANBU.

Something colder.

More structured.

Root.

Kagetsu's expression remained calm.

But his thoughts sharpened.

"I am being cataloged."

A faint pause.

Then a small smile formed.

"…Good."

That evening, the larva cocoon cracked.

A single sound echoed in Kagetsu's room.

Soft.

Wet.

Alive.

A thin black limb emerged from the opening.

Then another.

And another.

Kagetsu leaned forward slightly.

The system panel flickered violently.

[Unknown Entity Evolution Complete]

Classification: Undetermined

Status: Multi-body emergence detected

Warning: Behavior pattern unstable

The cocoon split open further.

Inside, multiple identical larvae-like forms began crawling out.

Not one.

Not two.

But dozens.

All sharing the same genetic signature.

All responding to Kagetsu's presence simultaneously.

They turned toward him.

As one.

And for the first time…

Kagetsu felt something unfamiliar.

Not fear.

Not excitement.

But confirmation.

"They are learning independence."

A pause.

Then softly:

"This is becoming a colony system."

Outside the window, far beyond the compound walls…

A shadow watched.

And did not move.

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