Tsunade's methods were rather limited. Her narrow perspective had left her able to use only chakra, and chakra had no effect whatsoever on radioactive elements.
In the end, she watched those cells turn completely to ash. She sighed and said with a hint of unwillingness:
"I'll definitely heal your body. If the Mystical Palm Technique won't work, then I'll create an even more powerful Medical Ninjutsu and truly get you out of that wheelchair."
She said those words not only to Uchiha Yuu, but also to herself.
As the founder of Medical Ninjutsu, Tsunade had seen many difficult and complicated illnesses. It was through those cases that she had eventually created the Mystical Palm Technique.
If she could uncover the cause of Uchiha Yuu's bodily mutation, her Medical Ninjutsu could rise to another level.
"Thank you, Lady Tsunade."
Uchiha Yuu was not too upset. With his current rate of recovery, he would be able to leave the wheelchair in a week at most.
He had waited through several years already, so what was one more week? Watching Tsunade seriously analyze his flesh and blood, he recalled that warm chakra energy from earlier.
"Can I study Medical Ninjutsu? Only I understand my own body best. I hope to use Lady Tsunade's medical knowledge to overcome the difficulties with my body."
He calmly voiced what was on his mind.
The requirements for becoming a medical ninja were extremely demanding. Ordinary chakra was not enough; it required Yang Release Chakra.
"You want to become a medical ninja?"
Tsunade's hands paused slightly as she worked on the experiment. She raised her head and looked at Uchiha Yuu lying on the operating table, but she did not discourage him just because he was a child.
Tsunade knew about the Uchiha Clan's bloodline, but she did not point it out.
In Tsunade's eyes, medical ninja carried a sacred mission. It was not something that could be accomplished with a single declaration or goal, so she patiently explained:
"To become a medical ninja, you need talent. But before that, you'll need to learn a vast amount of medical knowledge. Otherwise, if you stitch the wrong place while treating someone, you'll only be sending them to their death."
She was not joking. Once on the battlefield, circumstances could become urgent. A single lapse could lead to stitching the wrong place, and even if Medical Ninjutsu was used afterward, it could still leave behind fatal hidden injuries.
"Isn't it just medical knowledge? If possible, I can start studying now and intern at the hospital after graduation."
Seeing the determination in his eyes, Tsunade did not deliberately discourage him. After all, she had already organized that medical knowledge into a rough general framework.
Yet the material it contained was incredibly miscellaneous. Starting from scratch would undoubtedly be an enormous undertaking.
He also needed a particular kind of chakra, and he seemingly did not meet that requirement. She could only hope that she might develop other forms of Medical Ninjutsu in the future.
"Fine. Since you're confident, I'll give you some books once we leave the laboratory."
The preliminary examination did not take very long.
After changing all the bandages on Uchiha Yuu's body and applying medicinal powder to the ulcerated areas, they were able to leave the laboratory.
"I thought I'd suffer much worse."
After leaving the laboratory, Uchiha Yuu listened to the terrifying screams coming from the neighboring room. The desperate, hysterical howls would have made anyone unfamiliar with the situation think someone was being tortured.
"Medical ninja aren't as cruel as you think."
Tsunade hurriedly pushed him through the corridor, doing her best to make medical ninja sound less frightening:
"I know your physical condition. Large-scale experiments like that could never be performed on you. I haven't gone so mad that I'd use a child to develop ninjutsu."
On the second floor of the hospital was a separate room containing the medical materials Tsunade had organized. Since they were all foundational materials, there were not many security measures.
After sorting through them, she pulled out a huge stack of books.
Bang!
They hit the ground and kicked up a cloud of dust. Tsunade looked at the books, which were as tall as he was.
"These are the introductory books. First, you need to learn the structures of the human body."
Uchiha Yuu immediately turned to stone. He knew studying Medical Ninjutsu would be difficult, but the very first hurdle seemed impossibly hard.
"There's way too much of this. Is this really something someone my age should be dealing with?"
The Ninja Academy did not teach specialized medical knowledge. Most of its lessons were about the Third Hokage's Will of Fire, along with basic ninjutsu and taijutsu training.
Forget carrying the books piled before him—he felt it would be difficult enough just to hold them.
Sure enough, every medical ninja in the world of Naruto had made Medical Ninjutsu seem effortless.
Only when it fell on him did he realize that having all this stuff piled on him could truly be deadly!
He suddenly regretted his decision to become a medical ninja.
Still, Uchiha Yuu casually flipped open the first page.
Because of his body, he could not practice taijutsu for the time being, so he devoted all the time he had saved to reading medical books.
"These are only the introductory materials. Don't underestimate them. In other villages, they would be regarded as classified documents."
Only then did Tsunade realize that she had organized rather a lot of material. Dropping an entire set of medical books on young Uchiha Yuu had given him a childhood trauma.
"Study them carefully first. If you learn them well enough, I can find a medical ninja to serve as your squad leader after you graduate."
"Your missions will be much easier too."
Even if he could not become a medical ninja, Tsunade still wanted to cultivate more medical talent for the village. If another great war broke out in the future, there would be fewer casualties.
"These books really taught me a lesson."
Uchiha Yuu was certain that because of his body, the sunlight he absorbed would also produce Yang Release Chakra.
After all, the Uchiha Clan had never produced a medical ninja.
The Uchiha bloodline produced Yin Release Chakra.
With those two powers combined, he would surely become one of the strongest in the future.
After giving him a brief lecture, Tsunade realized that transporting all those materials back to his home would be no small matter.
She could only have someone follow behind him, carrying the books as they left Konoha Hospital together.
As for why Tsunade did not personally see him off, it was because they belonged to opposing camps.
Sometimes, the circumstances of one's birth meant reconciliation was impossible.
To avoid unnecessary trouble, Tsunade did not intend to reveal anything for the time being. Only after the situation between the two sides eased in the future, or after he had truly learned all that medical knowledge, would she acknowledge their relationship.
The news that Uchiha Yuu had secretly become Tsunade's experimental assistant did not spread far and wide.
However, Tsunade had overlooked one person.
"Why is Tsunade walking with an Uchiha?"
Danzo's gaze carried a trace of coldness. The failure of the previous mission had cost him two ANBU members and caused no small amount of trouble.
And an Uchiha had been present at the time.
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