Naruto: I, a decent person, have become the mastermind behind all this!

The Yin Seal technique originated from her grandmother Uzumaki Mito. It can be said that this technique belongs to the Uzumaki clan.

But in fact, before Uzumaki Mito, no one from the Uzumaki clan had ever practiced.

Because the founder was Uzumaki Mito, and the reason for choosing it on the forehead, Tsunade naturally knew that the tailed beast in her grandmother was sealed in the abdomen.

Even the Yin Seal technique itself was developed to target the Kyuubi, using huge chakra to fight against the Kyuubi.

The Nine-Tails had no problems in Mito Uzumaki's body for so long and was completely suppressed. In addition to Mito Uzumaki's own strength, the Yin seal also played a major role.

However, these Tsunade naturally would not mention it to Hoshita Hide, and said: "There is no problem in placing the Yin seal on the abdomen, but how do you plan to solve the problem mentioned last time?"

Although she had a solution, she still had to test Hoshita Shuichi.

Hoshita Shuichi smiled and said: "Tsunade-sama must know about the Four Elephants Seal."

"I asked Mr. Minato about the sealing technique before, and he taught me this sealing technique."

"So, my idea is to use two four-image seals outside the Yin seal to form a cycle, one in and one out, without interfering with each other."

Tsunade was lost in thought as she listened and began to construct a combination of three sealing techniques in her brain.

After a moment, Tsunade nodded and said: "At present, there is no problem technically."

"And this design is indeed more suitable for you."

"However, this adds a lot of difficulty. In addition to the Yin Seal, you also need to learn the Four Elephants Seal, which takes more time."

Hoshita Shuichi laughed after hearing this and said: "Although I do feel that my chakra is very little and not enough, I am only less than seven years old now, so there is no rush!"

After hearing this, Tsunade said nothing more and nodded: "Then let's do it!"

"Just go ask Minato for help with the Four Symbols Seal."

After saying that, she moved her fingers and clicked them continuously: "Since you don't have to learn Yin Seal anymore, let's continue the previous sparring!"

"You're not very good at chakra bursts yet."

Hoshita's eyes twitched, and she quickly said: "Wait a minute, Tsunade-sama."

"Although placing the Yin seal on the abdomen is also a good idea, it does not mean that we have to abandon the previous idea."

Only adults make choices, children of course want them all!

…

The residence of the Nine-Tailed Jinchuuriki.

Jiraiya found Namikaze Minato here who was studying sealing techniques with Uzumaki Kushina.

Regarding Jiraiya's arrival, Namikaze Minato was very surprised: "Jiraiya-sensei, you are finally back!"

"yes!"

Recalling those days in the Land of Rain, Jiraiya smiled with sincere joy: "That was a very special trip."

"Hey, it's been so long, Minato, have you completed the idea you mentioned before?"

After hearing this, Uzumaki Kushina, who brought the tea, said: "Jiraiya-sensei is talking about the Rasengan, right?"

"Rasengan?"

Jiraiya said impatiently: "As expected of Minato, it seems it's finished, so let's show it off quickly."

Namikaze Minato smiled and said, "If it wasn't for Shuichi, it wouldn't have been completed so quickly."

"Shuichi is the student I am leading now, a very talented and outstanding ninja!"

After hearing this, Jiraiya immediately thought of the polite, comely, and gentle kid, and he suddenly realized: "It turns out to be him. No wonder he got Tsunade's favor. It seems not easy!"

"Hey, Jiraiya-sensei, have you met Shuichi yet?"

"Shuichi is indeed valued by Tsunade-sama. His talent in medical ninjutsu is also very outstanding. Now he is a medical ninja who can stand alone."

Namikaze Minato was full of praise.

Jiraiya heard this and smiled and said: "It seems that Minato you have the intention to focus on training."

Students and direct disciples are still different.

"indeed so!"

Namikaze Minato admitted, and immediately stretched out his right hand and spread his palm: "But now let's see the new technique!"

Buzz!

The air flow was turbulent, and the blue spiral pill formed rapidly.

Jiraiya's eyes widened: "It's a perfect ninjutsu, and it suits you very well!"

Uzumaki Kushina put her hands on her hips and interrupted: "Jiraiya-sensei, this technique was developed for me by Minato, and it is the most suitable for me!"

Jiraiya didn't dare to mess with this little pepper, so he quickly smiled and said: "Of course, this technique can be used to deal with that guy Kyuubi."

"The power of this technique is completely determined by the amount of chakra."

Uzumaki Kushina heard this and said helplessly: "Now all my chakra is used to suppress that Kyuubi guy. Otherwise, I can use the Yin seal to store chakra."

Namikaze Minato quickly comforted him: "When you become more proficient in the secret technique of King Kong Blockade, you can better suppress the Kyuubi."

"Also, your current chakra level has not reached its highest level, but the Kyuubi will not become stronger."

Uzumaki Kushina immediately laughed after hearing this: "That's true."

"Hmph, I must teach that Kyuubi guy a lesson when the time comes."

Jiraiya looked at the two of them and couldn't help but secretly sigh that they were made for each other.

One is stupid and the other is real!

…

After returning home from Konoha Hospital, Hoshita Shuichi officially began to practice the Yin Seal technique.

To put it simply, the Yin Seal technique is to open a place to store chakra in the acupuncture points on the forehead and between the eyebrows. It can be imagined as a reservoir, and chakra is water.

Unlike Tsunade, Shuichi Hoshita needs to open two reservoirs, one large and one small.

The large one is used to store chakra for critical moments.

The small one is for daily use.

Although it is a bit troublesome, it is the only way before mastering the Four Symbols Seal and Eight Diagrams Seal.

Unlike the previous seal-memory palace technique, Shuichi Hoshita, who has greatly improved his seal technique, no longer needs to draw the seal technique before performing it. Instead, he uses the seal to assist in turning his chakra into a spell to form a seal technique.

However, it took him a full minute to make the seal.

"Yin seal!"

At the end of the seal, Shuichi Hoshita closed his hands, and dense tadpole-like spells immediately appeared on his body, and then the spells squirmed and gathered on his forehead to form a seal mark, and then the seal disappeared.

Then, Shuichi Hoshita lowered his eyes to refine chakra, which continuously flowed into the two sealed reservoirs.

On October 6, the 39th year of Konoha, Shuichi Hoshita officially began to practice Yin Seal!

In order to better develop new ninjutsu and impact the term "medical expert", Shuichi Hoshita began to reduce the missions outside the village.

Most of the time, he practiced in Konoha Hospital or the village, and occasionally went out of the village with Minato Namikaze and others to perform missions.

Unknowingly, the temperature began to drop, and it was already late autumn.

On this day, Shuichi Hoshita, who had accumulated a lot of fatigue, invited Tsunade to take a hot spring bath to no avail, so he came to the hot spring street of Konoha alone, ready to relax.

"Huh?"

Shuichi Hoshita noticed that there seemed to be someone on the roof.

"Jiraiya, this old pervert..."

Shuichi Hoshita paused.

He actually peeked, it was too immoral, and he must be severely criticized.