Naruto: My version is ahead of the ninja world

"Senior Yu Xuan, my sister has told me in detail what happened yesterday. If it weren't for your timely rescue, I wouldn't have survived."

"I know that a simple thank you is not enough to express my gratitude for saving my life..."

Nawaki was saying things that were a bit beyond his age, and Yuzuru felt a little awkward listening to him, so he reached out to stop him.

"We are all Konoha ninjas. If I can help, of course I will. You don't need to overthink it."

"You're amazing, stronger than many adult ninjas, and you protected your teammates in that crisis situation."

Yu Xian praised him, and this wasn't just politeness. For example, if Yu Xian were to encounter an explosion, his first reaction would definitely be to protect himself.

Nawaki scratched his head, feeling somewhat uncomfortable with Yugen's praise, because he felt he hadn't protected his teammates well.

At this moment, Yugen noticed Tsunade outside the ward. He left Nawaki with the words, "Get some rest and I hope you recover soon," and then temporarily left the ward.

Tsunade approached Yugen, but before she could speak, Yugen cut her off, saying, "Lady Tsunade, there's no need for thanks."

Tsunade opened her mouth, but could only manage a forced smile. "Alright, then I won't stand on ceremony."

We're all ninjas walking the line between life and death. Let's not talk about taking life and death lightly. Now that the person has been saved, let's not keep going around in circles with these few words.

"You've always wanted to learn medical ninjutsu, haven't you? These are my notes, and the knowledge points are more in-depth than the ones I lent you before." Tsunade handed several notebooks to Yugen.

Previously, when he was on the front lines, the notes Yu Xian received were only at the beginner level, but now what he has received can be considered advanced.

"Then I'll accept it without hesitation." Yu Xian took the notebook without any ceremony.

Tsunade was satisfied with Hagen's attitude, as her reciprocation or gesture of goodwill was accepted.

But a person's mood can change all the time. Yesterday she was glad that her younger brother had survived, but today she was heartbroken that he had lost a leg... Of course, she wasn't blaming anyone, she was just simply feeling sorry for him.

"Yu Xian, do you have the ability to promote rapid cell regeneration?"

It's hard to say whether Tsunade asked this question with no hope or with hope, but in any case, Hagen's answer would definitely disappoint her.

Yu Xian shook his head and said, "I can't do that. Like I said before, I can only perform emergency treatments, which is not proper medical practice. On the contrary, it's more like a crooked path."

I want to help my younger brother get his broken leg back on, but asking Yu Xian won't do any good. If Yu Xian had a way, he wouldn't have broken the other person's leg yesterday.

Hearing him say that, Tsunade's eyes dimmed a little. She understood, but she was still disappointed.

"Just like I just told Rope Tree, puppetry can basically solve the problem, but puppet limbs may be difficult to manipulate, and making intricate puppet limbs is not a simple matter."

Puppetry originated in Sunagakure, but Konoha was not entirely unaware of this technique. In fact, there were even people in Konoha who used puppet limbs. Yugen's suggestion was undoubtedly quite feasible.

"Puppetry is indeed a method." Tsunade didn't particularly like these prosthetics, but ultimately she had to consider how to solve the problem.

"Bioengineered prosthetics are quite difficult, and I know even less about that. But finding a good host body is hard... No, you are, after all, descendants of the First Hokage. Maybe you can use cloning technology to create prosthetics."

Yu Xian's words were brief; it was already good enough that he mentioned the First Hokage. If he had directly mentioned the First Hokage's cells, it would have been too deliberate.

"Grandfather...?"

Seeing Tsunade's thoughtful expression, Hagen knew that he had achieved his goal.

"Lady Tsunade, please feel free to contact me if you need any help. I'll do my best to assist you."

Yes, if Tsunade needs help researching Hashirama's cells, Hagen would definitely be happy to lend a hand.

Tsunade nodded. At this point, she certainly didn't have a clear research plan, and she might not have even thought about using Hashirama cells to make prosthetics, but she felt that Hagen's ability to manipulate cells would definitely come in handy at some point.

However, she had one more question: "Yu Xian, may I know how you acquired this ability?"

She seemed to be digging deep, but that wasn't actually the case. Even if Yu Xian said that his "healing ability" was innate and similar in nature to a family secret technique or bloodline limit, she would still be willing to believe it.

Fortunately, Yu Xian wasn't so perfunctory. He said, "I was only able to do this after I went to Ryuchi Cave and mastered the Sage Transformation ability... Essentially, it's just using natural energy to make the body exhibit a high degree of activation."

"I see." Tsunade would naturally believe this answer, as it aligned with her understanding.

She was familiar with things like natural energy, Sage Chakra, and Sage Mode, and in her understanding, these things could indeed bring extremely strong self-healing abilities.

Unconsciously, Tsunade's thoughts increasingly extended towards the First Hokage.

Yugen's guidance was subtle yet effective; even for the sake of her brother, Tsunade would eventually begin researching the First Hokage's cells.

Because Tsunade was very busy, the two only exchanged a few words about Nawaki before Haguru left with her medical research notes.

Afterwards, Yugen met with Kohinata Shingen. Shingen had also participated in the operation yesterday, so he hadn't had time to catch any intruders.

However, after the incident calmed down, Zhenyan decided to continue catching rats, believing that the other party was likely to take advantage of the situation.

Yu Xian felt that Zhen Yan's judgment made some sense. He continued to do what he was supposed to do in Konoha as usual, while Zhen Yan remained hidden in the shadows, ready to take action at any time.

So in the afternoon, Yugen continued to study in the ninjutsu library of the Hokage's office building, where he was still researching Lightning Release.

Moreover, the research focuses on advanced techniques, specifically how to constrain lightning release into special shapes.

From Chidori/Raikiri to Chidori Stream, and then to Chidori Sharp Spear, the research direction is very clear.

For those without the Sharingan, Chidori is useless; the two derivative techniques are more practical.

"Indeed, the current should be 'launched' at a higher power. Rather than describing the lightning blade as an extension of the current, it's more accurate to describe it as a penetrating effect..."

After another afternoon of research, Yu Xian finally found a reliable development idea.

It's definitely necessary to find a way to get the "Light Blade" out. Just think, if Yuzuru had been able to pull out a "Greatsword" that was at least five meters long when he was dealing with Manda, he wouldn't have had to go through so much trouble. He might have even been able to cut Manda in two with one stroke.