There Were Many Geniuses, but They All Called Me a Genius

Uchiha Chiri struggled to calm her turbulent emotions and forcibly suppressed the stirring in her heart before asking:

"What kind of experiment are you talking about?"

Toji raised his eyes to the drifting clouds on the horizon and said calmly:

"During your recent physical examinations, my Mystical Palm Technique chakra detected that your brain secretes a special kind of chakra."

"I suspect that it is the root cause affecting the cerebellum and triggering Bloodline Disease. Once you master the Yin Seal, I need you to slowly store this special chakra within it."

"After you accumulate a sufficient amount, I'll have you release the Yin Seal and discharge all of that chakra at once."

"Then I'll find a way to extract that special chakra from your body and use it as a research sample."

Toji paused, his voice scattering on the wind. "By then... your Bloodline Disease might be completely cured. We may even be able to use it as a sample to standardize treatment for Bloodline Disease."

The cleverest lies were nine parts truth and one part falsehood.

The reason Toji gave was undoubtedly convincing.

Primordial Chakra was indeed closely linked to the brain. It might truly hold the key to curing Bloodline Disease.

But to him, that was merely a byproduct.

His true goal was simply to use this perfectly legitimate excuse to collect Mangekyō Sharingan Primordial Chakra and put it into the Artificial Mangekyō Sharingan project...

"So that's how it is."

Uchiha Chiri instinctively felt that something was off.

The brain...

Or rather, every organ and every part of the body was a secret to a ninja at all times. Even during missions, if a teammate died, their body had to be destroyed to prevent the enemy from uncovering any secrets.

That was even more true for clans like the Uchiha and Hyuga, who possessed dōjutsu bloodlines.

Forget outsiders—this was not a field even fellow clansmen could casually touch.

But her trust in Toji made Chiri automatically overlook that unease.

She took Toji's hands and pressed them against her temples, asking softly, "Can you sense that special chakra now?"

After saying that,

her pupils turned crimson, and three tomoe appeared in her eyes.

"Mm, I can sense it." Toji's expression did not change. "When the Sharingan is activated, chakra is sent from the heart to the brain, where it is transformed into this special chakra that can activate the Sharingan."

"I call it Primordial Chakra."

As he spoke, Toji activated the Mystical Palm Technique and injected chakra into Chiri's brain, dispersing the excess Primordial Chakra so it would not flow back into her body.

"Now deactivate your Sharingan."

The three tomoe spun like wheels of fate before fading away, and Chiri's eyes returned to their clear black color.

This brazen attempt allowed Toji to sense the existence of Primordial Chakra even more clearly.

He asked gently, "Just now, I used the Mystical Palm Technique to counteract the Primordial Chakra. Did you feel any discomfort?"

"No." Uchiha Chiri shook her head. "Actually, if you hadn't mentioned it, I would barely have noticed that the excess portion even existed."

The conclusion had been confirmed.

Even if this tiny surplus of Primordial Chakra was stripped from the body, it would not affect the host.

Naturally, the ideal outcome was to complete the experiment without harming her body. If hurting her had been necessary, Toji might still have pushed the plan forward, but he would inevitably have carried some guilt in his heart.

Maintaining physical and mental health was important.

"That's great." Toji smiled from the bottom of his heart. "I was worried that extracting this chakra would burden your body. That would hurt me too."

Uchiha Chiri's eyes flickered. "Toji..."

"Still, this is also the troublesome part. After mastering the Yin Seal, you'll need to activate your Sharingan once every day and store that surplus Primordial Chakra in the Yin Seal each time."

"I know it's difficult, but this is an order."

Toji placed his hands on Uchiha Chiri's shoulders. "Chiri, you can do it, right?"

Uchiha Chiri's gaze hardened:

"I'll do it!"

She came back to herself, her tone carrying the pride of an Uchiha genius. "Don't underestimate me. There were many geniuses in the Warring States Period, but everyone called me a genius."

"Then let me see the brilliance of the Uchiha genius of the Warring States Period."

"Hahahaha!"

Toji's unrestrained laughter echoed through the Zenin underground laboratory.

Everything had unfolded exactly as he expected. Uchiha Chiri had accepted the "poisoned" apple he offered without the slightest suspicion.

Toji had done everything he needed to do.

The pressure of researching the Sharingan now rested entirely on Uchiha Chiri's shoulders.

Once she mastered the Yin Seal, the next stage of research would begin.

For example—

As the mother body, if an Uchiha ninja was forcibly induced to awaken the Mangekyō Sharingan using her Primordial Chakra, would they be able to use Mangekyō dōjutsu? Would the dōjutsu's tendencies be inherited from the mother body, or would they belong to the one who awakened it?

Those were all matters awaiting confirmation.

Speaking of the Mangekyō Sharingan,

Toji still did not know the full extent of Chiri's dōjutsu abilities.

She kept them tightly guarded.

She had only mentioned in casual conversation that she possessed the power to make targets recognize reality through illusion.

Combined with the battle at Naka Shrine that night, Toji concluded that one of her dōjutsu was Izanami.

Uchiha Chiri was the creator of Izanami. The Izanami passed down among the later Uchiha was likely a simplified version of her dōjutsu, at the cost of one eye being permanently blinded.

Chiri's Mangekyō Sharingan-level Izanami, however, could be used on multiple people at once. Its price was not blindness, but an aggravation of her Bloodline Disease.

As for the ability of her other Mangekyō Sharingan, Uchiha Chiri had revealed absolutely nothing.

Dōjutsu were secrets, and to a scientific madman like Toji, the "unknown" held an attraction bordering on obsession.

Sooner or later, he would uncover it.

Some time later,

under Chiri's guidance, Toji learned three C-rank Fire Release techniques in succession: Great Fireball, Phoenix Flower Jutsu, and Dragon Flame Jutsu.

Uchiha Chiri wanted to continue teaching him higher-level B-rank Fire Release techniques, but Toji refused on the grounds that he could not delay her.

With his talent for ninjutsu, mastering B-rank techniques would take considerably more time. It would not only delay himself, but also Chiri's time to learn the Yin Seal.

Toji's Fire Release training came to an end.

His next stop was the Senju Clan, where he began learning Water Release and Earth Release.

After Hashirama returned to the village, Tobirama stepped down as acting Hokage and resumed going out to gather intelligence. It was normal for him to be away from home for ten days or half a month at a time.

The one responsible for teaching Toji ninjutsu was Senju Touka.

To thank Toji for reattaching her arms, Touka was exceptionally diligent in teaching him.

On the occasional days when Tobirama returned to the village, Tobirama personally instructed Toji in Water Release.

The most classic technique he taught was the Water Dragon Jutsu, which required only three hand seals to activate.

While Toji's main body steadily learned ninjutsu in daily life, his two Shadow Clones remained in the underground laboratory, worked day and night to develop Impure World Reincarnation and the Yin Seal.