There are many geniuses, but they all call me genius

Uchiha Chirori, her heart unsettled, forcibly suppressed the palpitations within and asked:

"The experiment you speak of, what kind of experiment is it?"

Toji raised his eyes to the drifting clouds in the sky and said calmly:

"During your recent check-ups, my Mystical Palm Technique chakra observed that your brain secretes a special type of chakra."

"I suspect that this is the very root of the bloodline disease affecting your cerebellum. I need you to attempt to slowly store this special chakra after you have mastered the Yin Seal."

"Once you have accumulated a sufficient amount, I will have you release the Yin Seal and discharge this chakra all at once."

"Then, I will find a way to extract this special chakra from your body to use as a research sample."

Toji paused, his voice drifting away with the wind: "At that time... your bloodline disease might be completely cured. We could even use this as a sample to standardize a treatment regimen for the disease."

The most brilliant lies are nine parts truth and one part falsehood.

The reason Toji provided was undoubtedly convincing.

Primordial Chakra was indeed closely related to the brain, and it might truly hold the key to curing the bloodline disease.

But for him, this was merely a side effect.

His true purpose was simply to use this legitimate excuse to collect Primordial Chakra from the Mangekyo and pour it into his Artificial Mangekyo project...

"So that's how it is."

Uchiha Chirori instinctively felt that something was strange.

The brain...

Or rather, all organs and the body itself were always a secret for a ninja. Even during missions, if a teammate died, their body had to be destroyed to prevent enemies from discovering any secrets within.

This was even more true for clans with ocular bloodline limits, like the Uchiha and the Hyuga.

Let alone outsiders, even members of one's own clan could not easily touch upon this domain.

But her trust in Toji made Chirori automatically ignore this strangeness.

She took the initiative to grab Toji's hands and press them against her temples, asking softly: "Can you feel the special chakra you mentioned right now?"

With that, her pupils turned scarlet, and three tomoe appeared in her eyes.

"Yes, I sense it." Toji's expression remained unchanged. "When you activate your eyes, chakra is transmitted from the heart to the brain, then transformed by the brain to form this special chakra that activates the Sharingan."

"I call it Primordial Chakra."

As he spoke, Toji channeled his Mystical Palm Technique into Chirori's brain, dispersing the excess Primordial Chakra to prevent it from flowing back into her body.

"Now, deactivate your Sharingan."

The three tomoe rotated like the wheels of fate until they vanished, and Chirori's eyes returned to a clear black.

This blatant attempt allowed Toji to perceive the existence of the Primordial Chakra even more clearly.

He asked with a gentle tone: "When I used the Mystical Palm Technique to counteract the Primordial Chakra just now, did you feel any discomfort?"

"No." Uchiha Chirori shook her head. "Actually, if you hadn't mentioned it to me, I would have barely noticed the existence of the excess portion."

The conclusion was verified.

This tiny amount of redundant Primordial Chakra would not affect the host even if it were stripped from the body.

Completing the experiment without harming her body was naturally the ideal scenario. If it had been necessary to harm her, Toji might have pushed forward with the plan anyway, but he would inevitably carry a bit of guilt.

Maintaining physical and mental health was a very important matter.

"That's great." Toji smiled from the bottom of his heart. "I was worried that extracting this chakra would be a burden on your body. I would be heartbroken if that happened."

Uchiha Chirori's eyes flickered: "Toji-kun..."

"However, this is also a troublesome point. After mastering the Yin Seal, you will need to activate your Sharingan once every day, and each time, store that portion of redundant Primordial Chakra into the Yin Seal."

"I know this is difficult, but this is an order."

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

Uchiha Chirori's gaze became resolute:

"I will do it!"

She regained her composure, her tone carrying the pride of an Uchiha genius: "Don't underestimate me. There were many geniuses in the Uchiha clan during the Warring States period, but everyone called me the genius."

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

"Hahahaha!"

Toji's unbridled laughter echoed through the Zenin Underground Laboratory.

Things were developing exactly in the direction he had anticipated; Uchiha Chirori had accepted the "poisoned" apple he offered without a shred of suspicion.

Toji had finished everything he needed to do.

From here on, the pressure of researching the Sharingan would fall entirely upon Uchiha Chirori.

Once she mastered the Yin Seal, it would mark the beginning of the next phase of research.

For instance—

As the progenitor, could an Uchiha ninja whose Mangekyo was forcibly birthed using her Primordial Chakra perform Mangekyo ocular techniques? Would the inclination of the ocular technique be inherited from the progenitor, or would it belong to the one who awakened the eyes?

These were all matters waiting to be verified.

Speaking of the Mangekyo.

Toji actually still did not know the full extent of Chirori's ocular abilities to this day.

She kept her mouth shut about it.

She had only mentioned in passing during casual conversation that she possessed the power to make a target recognize reality from falsehood.

Combining this with the battle at Naka Shrine that night, Toji deduced that one of her ocular techniques was Izanami.

Uchiha Chirori was the very creator of Izanami. The Izanami passed down among the Uchiha in later generations was likely a simplified version of her ocular technique, with the cost being the permanent blindness of one eye.

As for Chirori's Mangekyo-level Izanami, it could be activated against multiple people simultaneously, and the cost was not blindness, but rather the aggravation of the Bloodline Disease.

As for the ability of her other Mangekyo, Uchiha Chirori had not revealed a single thing.

Ocular techniques were secrets, and to a mad scientist like Toji, the "unknown" held an almost desperate attraction.

He would figure it out sooner or later.

Some time passed.

Under Chirori's guidance, Toji successively learned the three C-rank Fire Style techniques: Great Fireball, Phoenix Sage Fire, and Dragon Flame Technique.

Uchiha Chirori wanted to continue teaching him advanced B-rank Fire Style techniques, but Toji refused on the grounds that he "could not delay her."

Given his talent for ninjutsu, the time required to practice B-rank techniques would increase significantly, and it would not just delay himself, but also the time Chirori spent studying the Yin Seal.

Toji's Fire Style training came to an end there.

For the next leg of his journey, he came to the Senju Clan to begin learning Water Style and Earth Style.

After Hashirama returned to the village, Tobirama stepped down from his duties as acting Hokage and went back out to carry out intelligence-gathering missions; it was normal for him to be away from home for ten days or half a month at a time.

The person responsible for teaching Toji ninjutsu was Senju Toka.

To thank Toji for reattaching her arms, Toka was incredibly dedicated when it came to teaching him.

On the rare days when Tobirama returned to the village, he would personally instruct Toji in Water Style.

Among the techniques taught, the most classic was the Water Dragon Bullet Technique, which could be activated with only three hand seals.

Toji's original body learned ninjutsu step-by-step in his daily life, while his two Shadow Clones remained placed in the Underground Laboratory, being squeezed day and night to develop Reanimation and the Yin Seal.