Medical Ninjutsu will not heal injuries too quickly. Even the “Mystical Palm Technique” which is an advanced Medical Ninjutsu takes at least five minutes to deal with such large scratches (A/N: For normal Medical-nin).

Therefore, during this free time, Mishiro continued to explain, “Medical Ninjutsu uses a hand seal to make the physical energy in the chakra active, and then make this part of the activated chakra enter the body according to a specific combinations flow and release."

Sōseki said according to his own understanding, "Can you explain it like this? Chakra is a known number, Ninjutsu is a formula, and hand seal is an auxiliary calculation tool. The more powerful Ninjutsu which means the more complex the formula, the more hand seals that need to be used as an auxiliary calculation tool, and the final result is the Ninjutsu we want to release."

It was the first time that Mishiro heard such a novel explanation. She subconsciously felt that what Sōseki said made a lot of sense, but Shinobi's lack of attention to basic teaching made her a little uncertain, "Why do you think this way?"

Sōseki said seriously, "I read "Introduction to Chakra", "Encyclopedia of Ninjutsu", "Essentials of Ninjutsu " and many other books in the library today, but it all said that the three keys to using Ninjutsu are to have enough chakra, the correct hand seal, and a complete Ninjutsu’s formula."

Yumiko’s group on the side asked in doubts, "Is there anything wrong with this?"

"But I heard that the Shōdaime Hokage-sama who built Konoha can use Ninjutsu without hand seals." Sōseki said solemnly, "In other words, process of forming hand seal can be omitted, right?"

In Sōseki's view, if the hand seal is a calculation tool, then Shōdaime is a master of mental arithmetic, and he can skip the tedious process in the middle directly.

"It seems that you have also noticed the effect of hand seal on Medical Ninjutsu!" Mishiro sighed slightly. "Every second we consume in forming hand seal may make the injured’s condition worse, so every Medical-nin has to spend a lot of time practicing hand seal."

"However, even Tsunade-sama can't do things like no hand seal healing. Don't think too much, let alone ignore practicing hand seal."

Sōseki’s nodded vigorously, "I will."

His vision is very long-term. He thinks that training without trying to understand made people can't go far.

Seeing that Sōseki does not have the arrogance of ordinary geniuses, Mishiro was relieved, and then went on to explain, “Medical Ninjutsu and Genjutsu are much more difficult to use than general Ninjutsu, and the reason is because of chakra control. Generally, Ninjutsu only needs to mobilize the chakra in the body through the hand seal, but Medical Ninjutsu is different, it needs to precisely control the physical energy in the chakra composition."

Kotoko raised her hand and asked, "Mishiro-senpai, why don't we directly mobilize our physical energy when we use Medical Ninjutsu?"

"You're a Shinobi, have you forgotten even the most basic knowledge?" Mishiro replied angrily, "Physical energy and spiritual energy are more of a concept. Only when the two are merged into chakra can they be considered as a real entity. To achieve the situation you said, it needs someone’s physical energy that is strong enough to materialize, but how is that possible?"

"Oh." Kotoko shyly shrank her upon hearing this.

Sōseki put small hand on his chin and thought to himself, "Usually, a person uses Non-Attribute chakra plus Nature Transformation to use Ninjutsu. The reason why Senjutsu is so powerful is that the essence of chakra has changed. Could it be that the source of Shōdaime Hokage’s great strength is related to the essence of chakra?"

……

At night, in Sōseki’s small wood house.

Sōseki was sitting at the table, holding a knife, carefully making a shallow scar on the back of his left hand.

He then quickly formed hand seal with both of his hands, and then, his right hand, which was covered with green chakra, was placed on the back of his left hand.

"It’s a bit itchy and painful. It should be because the granulation tissue is accelerating and the nerve also recover slowly...a minute? Even if it’s just a small wound of this level, I still need one minute to heal it." Sōseki murmured, collecting the physical feedback carefully.

This is not to say that Sōseki is so kind that he would rather hurt himself than catch a few small animals for experiments. He did this just because only his body can get the most real feedback.

If the experience gained by simply using the healing technique is 1, and the experience gained by experimenting is 3, then the feedback experience that Sōseki is getting from his own body is 10!

With the limited amount of chakra he can refine in a day, this is the best way to improve his proficiency.

Furthermore, Sōseki also needs to figure out how much he can tolerate the pain and the precise recovery time when he uses Medical Ninjutsu.

As a Medical-nin, he must ensure that his physical condition is under absolute control at all times.

"Only in this way will I be able to precisely control myself in the battle that will take place in half a month... of how much I am injured!"

......

In this way, Sōseki took classes diligently during the day, immersed in the library at noon, "squeezed out" Asuma's remaining value after school, self-harming at home at night, and went to the hospital for internship on weekends.

During this period, although there were occasional youthful episodes, all of them were easily settled by Sōseki, and then he devoted all his energy to this extremely fulfilling study life.

Soon, half a month passed by.

Ding ding ding~ ——

When the school bell rang on time, there was a burst of cheers in the classroom, and then, almost all of the students turned their attention to today's two protagonists.

Because it is a private "duel", in order not to take up public time, Sōseki deliberately agreed to hold it after school today.

"Sōseki, you must win!"

"Class leader, it's up to you!"

"Asuma...um, nothing, I called it wrong."

Everyone around is cheering for the "two people".

Although Asuma doesn't care much about other people's opinions, he still couldn't help but feeling sour after listening the cheers.

At this time—"Asuma..."

When this sudden call, Asuma was refreshed, ‘It seemed that I still had supporters!’

Looking at the direction from which the voice came, the girls in the class seemed to form a united front and shouted to him:

"If you dare to win against Sōseki, we won't let you go!"

"You can't say that, Sōseki will be angry. But, if you dare to hurt Sōseki...hmph!"

"Aiya, don't talk about it. If you go on, Asuma will cry!"

Actually, they don't have much malice towards Asuma. Since Asuma and Sōseki became "friends", their perception about Asuma has also changed a lot. After all, how can someone who can be friends with Sōseki be a bad person.

Of course, the warning is also true!