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The stone chamber of the lab was colder than usual. The faint scent of antiseptics mingled with the iron tang of blood. On the table lay two Uchiha corpses, their pale skin glistening under the light of chakra lamps.
Kirito's clones stood silently around him, waiting for instruction. His eyes narrowed as he tightened his gloves.
"Preservation was step one. Now… we begin the real work."
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Anatomy of Power
Kirito's first focus was on chakra pathways.
Using precision scalpels and chakra threads, he dissected the Uchiha bodies, tracing their chakra circulatory systems. The Sharingan, unlike normal eyes, connected directly to secondary chakra nodes near the temples and brainstem.
He noted every pattern.
Every difference compared to a non-Uchiha corpse he had stolen earlier.
> "So that's it. The Sharingan isn't just an eye—it's an organ tied directly into the nervous system and chakra network. No wonder ordinary transplants fail so often."
His clones drew detailed diagrams, building a growing library of anatomical scrolls.
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Infusing Chakra
Next came infusion tests.
One clone carefully channeled neutral chakra into a preserved Sharingan suspended in a solution. The eye flickered, tomoe spinning once before dimming.
Another attempted fire-natured chakra. The eye resisted, crackled, then split open like overboiled fruit. Failure.
But when yin-natured chakra was carefully injected, the Sharingan pulsed, glowing faintly as if awakening.
Kirito smirked.
"Of course… it thrives on yin. The essence of imagination, genjutsu, and spirit. Fire alone won't do."
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Bloodline Experimentation
Weeks passed. Kirito prepared more daring experiments. He extracted blood samples from Uchiha corpses and compared them to his own. The differences were staggering—Uchiha blood carried an unusual chakra density and a reactive quality near neural tissue.
He attempted his first fusion experiment, injecting diluted Uchiha blood into lab animals.
The rats died within hours, their bodies burning out from chakra overload.
A rabbit survived for three days, its eyes faintly red before collapsing into seizures.
A single stray dog lasted a week—its right eye showing a faint tomoe before it went blind.
Kirito watched every death, noting symptoms coldly.
"Unstable. But promising. I'll need a carrier… a seal to stabilize the merge."
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The Seal of Assimilation
Through endless trial and error with his clones, he began designing a fuinjutsu array etched directly into flesh.
The seal was designed to act as a mediator, regulating the flow of foreign chakra into the host's system.
One night, he carved the seal into a rat and implanted a freshly preserved Sharingan into its skull. For hours, nothing happened.
Then, at dawn—the eye opened.
A single tomoe rotated weakly.
The rat survived.
Kirito's heart pounded as he recorded the result.
"This… this is it. Proof of concept. If a rat can adapt, so can I."
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Dangerous Thoughts
But he didn't implant yet. He was cautious. Too cautious to risk his own body so early.
Instead, he refined. He created multiple variations of the assimilation seal, testing them on animals and then on the nine Uchiha bodies. The corpses did not revive, but the chakra within their Sharingan remained stable longer, allowing extended activation even post-mortem.
His mind raced with possibilities.
A mask powered by multiple eyes.
A puppet infused with Sharingan.
A seal that could allow him to borrow genjutsu powers temporarily without permanent implantation.
Each idea was scribbled in secret scrolls and hidden deep in the lab.
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Whisper of Madness
Yet, as he worked late into the night, surrounded by jars of spinning red eyes, something began gnawing at him.
Sometimes, when he pushed chakra into the eyes, he swore he could hear faint whispers. Screams. Echoes of Uchiha who once owned them.
Were they remnants of chakra memory? Or his imagination?
Kirito didn't care. He pushed forward.
"Power always comes at a cost. And I'll pay it—whatever it takes."
As dawn broke over Konoha, the lab's candles sputtered out one by one. Only the glow of the Sharingan jars remained, watching him like countless unblinking sentinels.
And Kirito, standing before them, smiled.
"Soon… I'll awaken a Sharingan of my own."
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