Naruto started to become stronger by becoming a disciple of Tsunade

"This is the move I'm going to teach you this time!" Tsunade looked around at the stunned Okamoto Dousuke and Shizune.

"Creating chakra out of thin air?" Shizune's lips curled up slightly, causing her perky nose to wrinkle upwards.

Thinking of Tsunade's words and the scroll in her hand, Okamoto Dousuke had a slight guess in his mind, but under the uncertain situation, he did not say it out loud.

Instead, Shizune pointed at the scroll in Tsunade's hand in a puzzled tone and said, "Teacher, the method you mentioned of creating chakra out of thin air is not recorded in this scroll, right?"

"Ding ding ding, this is it." Tsunade placed the palm-sized scroll in her hand on her lap.

Gently unroll the scroll.

"What is this?" Looking at the diamond-shaped pattern on the first page of the scroll that Tsunade was slowly unfolding, Okamoto Dousuke thought to himself that it was indeed that technique.

"Teacher, what is this?" Shizune looked at Okamoto Dousuke and then at Tsunade and asked curiously?

"There used to be a very famous country in the ninja world, the Land of Whirlpools. The hidden ninja village in the Land of Whirlpools was called the Hidden Ninja Village of the Whirlpools."

"This country of Whirlpools is not very big, but they are very famous in the ninja world. Although the ninjas of the Hidden Whirlpool Village are not very strong in combat, they have very powerful sealing techniques."

The sealing technique of the Uzushiogakure is extremely powerful. When the first Hokage, who was once known as the God of the Ninja World, sealed the tailed beasts at the first Ninja World Conference, the sealing technique used to seal the tailed beasts came from the Uzushiogakure. Moreover, most of the sealing techniques used by various villages to seal the tailed beasts were also developed by the Uzushiogakure at that time.

The Uzushiogakure Village was once an ally of Konoha, but was destroyed in the subsequent Ninja World War.

There are only a few members of the Uzumaki clan left, and Uzumaki Kushina, the wife of the future Fourth Hokage, is one of the remnants of this clan.

"My grandmother, Uzumaki Mito, the wife of the first Hokage, was once a member of this village." Tsunade unfolded the scroll in her hand and recounted the origins of the scroll.

When talking about Uzumaki Mito, Tsunade paused noticeably.

But he only paused for a moment and then continued speaking.

"My grandmother was the first Jinchūriki of the Nine-Tails in Konoha. When my grandmother became the Jinchūriki of the Nine-Tails, she discovered that frequent use of the Nine-Tails' chakra would be infected by the evil aura in the Nine-Tails' chakra."

"In order to combat the evil aura in the Nine-Tails' chakra, Grandmother Uzumaki Mito relied on the Uzumaki clan's rich knowledge of sealing techniques and finally developed a ninjutsu that can store the excess chakra."

"This jutsu is the Yin Seal," Tsunade said in a deep voice, pointing to a diamond-shaped symbol on the scroll.

"The main function of the Yin Seal is that it can store chakra during normal times, and release it at critical moments." Tsunade said, pointing to the diamond-shaped mark on his forehead.

"Because the Yin Seal needs to store chakra in the most mysterious part of the human body, the Yin Seal will greatly enhance the user's perception ability when the seal is released."

Okamoto Dousuke looked at the diamond-shaped mark on Tsunade's forehead and asked, "Teacher, can it only be stored on the forehead?"

Tsunade looked at Okamoto Dousuke and said in a serious tone: "Boy, I advise you not to tamper with the Yin Seal."

"Why the Yin Seal can only be stored on the forehead is something I don't understand either, but since this ninjutsu was developed by Uzumaki Mito's grandmother, she has left a note on the training method that cannot be changed."

"The brain has always been the most mysterious area of ​​the human body. Doujie, you must have a sense of awe!"

"I understand, teacher." Okamoto Dousuke looked at Tsunade's serious expression and understood.

Tsunade picked up the unfolded scroll and placed it in front of Okamoto Dousuke.

"Because of this mission, I will hand over this ninjutsu to you. If you don't understand anything, please ask me as soon as possible." Tsunade said to Okamoto Dousuke.

"Teacher, what about me?" Shizune shook her head left and right, looked at Tsunade, then looked at Okamoto Dousuke and asked.

"Shizune, as for you, this ninjutsu requires too subtle control of chakra. With your current control, I don't recommend you to practice it." Tsunade reached out and gently stroked Shizune's head, saying a little embarrassedly.

"Then what's the point of you asking me to come here, teacher?" Shizune pouted in dissatisfaction. It turned out that she was happy for nothing and was just a runner-up. She shook her head vigorously to shake off Tsunade's hand.

Okamoto Dousuke glanced at the not-so-long Yin Seal Scroll. Since he had learned the Flying Thunder God Technique, he had some experience in the art of sealing.

After just a cursory glance, Okamoto Dousuke understood the difficulty of the Yin Seal. No wonder Tsunade had never even mentioned it in front of him and Shizune before.

This time, maybe it was because of my own improvement in strength that I went to participate in the mission of the Snow Country alone. It was given to me in order to increase my strength.

Looking at Shizune who was still sulking, Okamoto Dousuke smiled gently and said, "Shizune, I'll teach you after I learn it. Don't worry now!"

"Yes!" Unexpectedly, after hearing what Okamoto Dousuke said, Shizune agreed immediately.

"Teacher, I'll go back first!" He put away the scroll of Yin Seal and looked at the clock hanging on the wall. The time was slowly pointing to late night.

"Well, go back, but you must come to me to carve the prototype of the Yin Seal." Tsunade looked at Okamoto Dousuke and instructed again.

"Okay, teacher, I understand. I won't gamble with my own safety!" After saying that, Okamoto Dousuke walked out of the lounge and put on his backpack.

After saying goodbye to Tsunade and Shizune, he walked out.

After leaving Konoha Hospital, Okamoto Dousuke took advantage of the night and walked towards his home.

As he walked, Okamoto Dousuke took stock of his growth over the past few years.

Touching the scroll in his pocket, Okamoto Dousuke felt a little warm in his heart. As early as when he became Tsunade's apprentice, Okamoto Dousuke had been coveting Tsunade's super power fist and Yin Seal.

Okamoto Dousuke has already learned the Super Power Punch. The principle is not difficult, but the difficult part is that Okamoto Dousuke does not have the body and chakra to support the Super Power Punch. I remember that in the original work, Sakura only started to exert her strength in the later period.

If Okamoto Dousuke had not relied on his training in the Wet Bone Forest to achieve a qualitative leap in chakra, he would never have been able to reach the special jonin level, which is above the chunin level.

But such an opportunity is hard to come by. Okamoto Dousuke also conducted subsequent experiments and found that his body had become immune to the Hero's Water.