"Now that I've agreed to the exchange, could you explain this technique?" Yūhi Shinku was so curious about it that he could not help pressing for an answer.
"I'm sure you know about Lady Tsunade's Superhuman Strength Technique, Senior Shinku. My technique is somewhat similar, except that it also incorporates some Medical Ninjutsu techniques."
"To put it simply, it uses an effect similar to the Chakra Scalpel to send the chakra concentrated in your fist into the enemy's flesh, then make it erupt."
"Of course, you can also choose not to make it erupt. In that case, your fist becomes as sharp as a blade and can pierce straight through the enemy's flesh."
After hearing Kōki's explanation, Yūhi Shinku's face was full of admiration.
He had no words left for Kōki's talent. He had actually combined the Superhuman Strength Technique with the Medical Ninjutsu technique Chakra Scalpel, giving it both the destructive power of the former and the sharpness of the latter. It was truly a genius idea.
Kurenai Yuhi, beside him, did not see what was so impressive about it at all. With her limited experience, she had been dazzled by the power of the first level and thought it was more formidable.
"Dad, the first level is clearly more powerful!"
Hearing his daughter's words, Yūhi Shinku explained with a smile.
"Kurenai, you're still too naive. Although the first level is good, the second is what's truly formidable. The second level lets you attack an enemy from within during combat. Once an enemy suffers an attack like that, they'll almost certainly be unable to fight again. In more serious cases, they may even die on the spot."
Yūhi Shinku explained the terrifying nature of this technique to his daughter. It was entirely geared toward killing with a single blow, making it quite brutal.
But it offered a tremendous improvement to an individual's strength. For a Genjutsu-type ninja like him in particular, this Taijutsu technique was like giving wings to a tiger.
Seeing that Yūhi Shinku was very satisfied with the secret Taijutsu technique he had offered, Kōki was pleased as well. Still, he could not help dampening his enthusiasm. "Senior Shinku, although this Taijutsu is very powerful, it's extremely difficult to learn and puts a ninja's talent for chakra control to the test. If your control isn't good enough, you'll hurt yourself instead."
"Also, before training in this Taijutsu, you must first learn some relevant Medical Ninjutsu knowledge. Ideally, you should also learn the Chakra Scalpel Ninjutsu."
"If you can't do those things, you'll only be able to train in the first level of Superhuman Strength."
Kōki explained the prerequisites for training in this special Superhuman Strength Technique up front, so Yūhi Shinku would have nothing to complain about if he failed to master it.
He believed that learning this Taijutsu was no easier than learning an S-rank Ninjutsu. It was not a technique ordinary people could master; only those with genuine talent could learn it.
"Also, don't force yourself to train in it before you meet the prerequisites, or you'll damage the chakra pathways inside your body." Kōki's tone carried a strong warning as he said this.
He did not want Yūhi Shinku to suffer a major loss of strength because he trained in the technique improperly. If that really happened, his good intentions would have done harm instead.
Faced with Kōki's well-meaning warning, Yūhi Shinku smiled and nodded. As the creator of this technique, Kōki knew very well what precautions it required. He certainly would not disregard his warning.
Kurenai Yuhi, beside him, was rather indignant, however.
"Don't underestimate my dad. He's an elite Jonin! He'll learn your technique in no time."
"That's enough, Kurenai. Even I'm not certain I can master this technique. It really is very difficult."
Yūhi Shinku stopped Kurenai from saying any more. Although he had confidence in himself, he could see how difficult this technique was. It would not be easy to master.
Even if he did master it, it would probably take quite some time.
Still, it did not matter if he truly could not master the second level. Completing the first level alone would directly improve his strength. All in all, he stood to lose nothing from this exchange.
"Since you're being so sincere, Kōki, I can hardly be stingy. I'll give you every Genjutsu I know, including my own Genjutsu research notes. If you have any questions, you can come and ask me at any time."
Yūhi Shinku no longer hesitated. He had been drawn in by Kōki's Superhuman Strength Technique and was even willing to give Kōki his own unique Genjutsu.
He believed that the value of the Superhuman Strength Technique Kōki had offered already far exceeded that of his Genjutsu.
At the same time, he thought very highly of Kōki's talent and wanted to see whether Kōki would produce something new after learning his Genjutsu.
"Thank you, Senior Shinku." As he spoke, he took a scroll from his pocket and handed it to Yūhi Shinku.
"Senior Shinku, this contains all my training material on the Superhuman Strength Technique, along with some precautions."
After accepting the scroll, Yūhi Shinku said to his daughter beside him, "Kurenai, go get the scroll in the first drawer in my study."
Hearing Yūhi Shinku's instructions, Kurenai Yuhi turned and left. Before long, she returned with a scroll in her hand. Yūhi Shinku took it and passed it to Kōki.
"This contains all my insights into Genjutsu, including my unique Genjutsu and some research on the subject."
"At the very end, there are also some insights into Yin Release. If you reach the end and don't understand it, come find me. I'll explain it to you." Yūhi Shinku assumed Kōki did not know what Yin Release was, so he told him to come find him if he did not understand the final section.
Little did he know that his research into Yin Release was what Kōki valued most.
Kōki's purpose in coming to learn Genjutsu was to develop his application and understanding of Yin Release chakra.
At first, he had felt that trading both levels of his Superhuman Strength techniques for Yūhi Shinku's Genjutsu techniques put him at a slight disadvantage.
But he had still offered his advanced technique, precisely because he wanted to test his guess that Yūhi Shinku had researched Yin Release.
Now, it seemed his guess had indeed been correct. Of course, even if he had been wrong, it would not have mattered. Kōki did not consider the Superhuman Strength Technique all that precious anyway, nor did he think his techniques were so easy to learn.
Some might ask why Kōki had guessed that Yūhi Shinku had researched Yin Release.
It was because Kōki had heard of Yūhi Shinku in his previous life and also knew that his daughter, Kurenai Yuhi, would become a Jonin skilled in Genjutsu.
After coming to the Shinobi World, Kōki had discovered that its teachings were closely guarded. They were essentially passed down only from masters to disciples or from parents to children.
Unless you earned a great deal of merit and gained the Hokage's recognition, allowing you to be taught Ninjutsu, you could only keep grinding away at the Three Basic Techniques learned at the Ninja Academy and a few simple C-rank release techniques.
Ordinary civilian ninja without connections had no access to advanced Ninjutsu.
Thus, the fact that Kurenai Yuhi would become a Jonin proficient in Genjutsu led Kōki to deduce that her father was also an accomplished Genjutsu master.
So Kōki had personally visited Yūhi Shinku to test his conjecture.
Their conversation had confirmed Kōki's guess. Yūhi Shinku had indeed researched Yin Release chakra, which immediately left him very satisfied with this exchange.