Naruto: The Strongest Sage.

Karin went to school happily. Yes, very happily. And this was only her second week of school.

Perhaps the scumbag of the Kusagakure ninja was too inhuman. Karin's experience in Konoha School allowed her to have some normal life for the first time in a long time.

Karin's admission to school was not a big deal. In addition, Aoba clearly felt that the Konoha upper echelons had relaxed their attention on him, so his admission was very smooth.

However, because Karin's foundation was too weak, she did not reach the same level as Sasuke and Naruto, but was one level lower than them.

This is actually what Aoba wanted. He didn't want Karin to get too close to the Twelve Young Masters of Konoha. Those kids either had family heritage or were Jinchūriki. There were too many eyes on them.

Karin will definitely participate in various experiments in the future, and she will have many more secrets. Paying too much attention to her is not a good thing.

In Karin's world, there aren't that many children from noble families. There are more civilian ninjas, so her life in school is still very happy.

And Karin is different from Naruto, although she is not as good as Sakura, but at least her grades are still excellent.

And perhaps because she knows that her current life is hard-earned, she studies very hard and has a solid foundation in theoretical knowledge.

After checking Karin's homework, Aoba was very satisfied.

"Okay, that's all for today. Those little brats outside must be your friends. They've been waiting for a while. Go have fun, and remember to come back for dinner in the evening."

"I know, I know, you're more nagging than my mother." Karin waved her hand and rushed out the door to play with her friends.

Behind Aoba, Yumi looked at Karin's figure and her eyes moistened slightly.

"Aoba, thank you so much."

"Haha. There's no need to be so reserved. To be honest, watching a child grow up healthy and happy is a kind of enjoyment in itself."

"Your thinking is really not like that of a ninja."

"Haha, ninja. What exactly is a ninja? Who decided this definition? I have always believed that everyone has their own answer. As long as you stick to your heart, it is correct."

"You really are different from other ninjas I've met."

"Maybe. Well, let's continue. You will be my assistant."

Every time after returning home from a mission, Qingye would dive into the laboratory.

The study of the Sealing Technique had been going on for a while. His learning ability was quite strong. Thanks to his strong mental power and the basic abilities he had learned from his previous life, he quickly mastered the Sealing Technique.

Sealing techniques are widely used in Naruto.

The most common one is the scroll of sealing materials. However, the user does not use the sealing technique. In fact, the sealing technique is drawn on the scroll in advance. The user only needs to inject chakra to start the closure, which is a fool-proof operation.

Moreover, this kind of scroll is very expensive to make. It is also easy to be damaged. After being used a few times, it will be discarded.

After understanding the basic logic of the sealing technique, Qingye did not study other advanced sealing techniques in depth, because he needed a technique that did not exist in this world.

He wanted to seal the life force that leaked out when Karin drew blood, and make it into a medicine that could be used at any time.

This requires a small but very precise sealing technique. Qingye looked for many sealing techniques for reference, and then tried to develop a suitable one himself.

This is not an easy task. It is more than twice as difficult as developing ninjutsu. Fortunately, Qingye has enough information.

Orochimaru is indeed the Hokage Doraemon. He has a lot of good stuff in his hands. I guess he has almost all the sealing techniques recorded in Konoha, except for the Shiki Fuujin, which is only known by the Hokage.

Qingye had failed many times before. But he had accumulated a lot of experience. This technique has been basically completed. Now it is time for the final test.

On the table in front of him was a complicated ritual. In the middle of the ritual was a needle-sized metal cylinder, which contained Karin's blood.

At this point, the vitality in the blood has been successfully sealed. However, this technique is still too complicated and too large to achieve Qingye's goal.

His requirement was that the formula must be able to be concentrated into a container as big as a needle. At that time, it would be more convenient to inject or drink directly. At the same time, it would also be more convenient to carry.

Qingye placed his hands around the cylinder and injected his own chakra. After a moment, the spell on the table began to slowly move. Like a living thing, it slowly climbed up the body of the metal cylinder.

A detailed and complex technique appeared on the metal cylinder. As Qingye operated, he carefully sensed the changes in the blood inside the cylinder.

The whole process is not complicated. But it requires a considerable amount of chakra and extremely high chakra control. Qingye soon felt sweat on his forehead. At this time, the technique was only compressed by about half.

At this time, Yumi next to him took out a Bingliang pill in time and stuffed it into Qingye's mouth.

The chakra replenished by the Hyoryangmaru finally allowed Aoba to hold on, and he barely completed the first compression process of the sealing technique.

Yumi wiped the sweat off her forehead with a towel. Qingye couldn't wait to pick up the metal cylinder and felt it carefully.

"It looks like it was successful. But it still needs to be tested in practice."

Qingye used a kunai to cut a wound on his arm, then picked up the blood next to it and drank it.

After a few seconds, the wound on his arm began to heal, but what concerned Qingye was that the speed was not as fast as he had imagined.

It took about thirty seconds for the wound to heal completely.

The effect was completely acceptable. But the speed did not meet his requirements. In Aoba's memory, Karin's recovery ability should be that any penetrating wound on the body could be healed quickly within ten seconds.

He thought about it, looked at the remaining blood, and thought of a possibility.

"It's blood. This seal forcibly seals the life force in the blood. After entering the human body, there is a release process. This process causes the wound healing effect to slow down."

Once the cause is found, the problem will naturally be easier to solve.

So far, the development of this drug has been basically successful. Even if the last problem is not solved, this thing is definitely a high-value recovery product.

Who wouldn’t want a potion that has no side effects and can quickly heal injuries?