Konoha streets.

After leaving the Konoha Interrogation Department, Hinata Ichiro and Tsunade walked on their way back to their residence.

"Tsunade-sensei, do you know the secret art of the Yamanaka clan to discover the memories of others?" asked Hinata Ichiro as he walked.

"Ichiro, why are you asking the Yamanaka clan about the secret technique of discovering other people's memories?" asked Tsunade curiously.

"Tsunade-sensei, I want to figure out why the Yamanaka clan's secret technique of discovering other people's memories requires the discovered person to have his brain intact!" Hinata Ichiro replied.

"Ichiro, that's the only reason you asked me about the Yamanaka clan's secret technique of discovering other people's memories?" asked Tsunade.

"Tsunade-sensei, at this stage, I ask you about the Yamanaka clan's secret technique of discovering other people's memories, and this is indeed the only reason I said!" Hinata Ichiro said.

"At this stage!?" Tsunade asked with a puzzled expression, "Ichiro, what do you mean by this stage?"

"Tsunade-sensei, if possible, I would like to develop a ninjutsu similar to the secret art of the Yamanaka clan to discover the memories of others!" Hinata Ichiro said.

"Ichiro, don't you have a way to find out the memories of others!" Tsunade asked, "Why do you want to develop a ninjutsu that is similar to the secret art of the Yamanaka clan to detect the memories of others?"

"Tsunade-sensei, I have a way to find out the memories of others, but my way to find out the memories of others needs to go through the soul of the person being discovered!" Hinata Ichiro said.

"Ichiro, are you afraid of causing taboo in others?" asked Tsunade with a thought in his heart.

"Tsunade-sensei, I'm really worried!" Hinata Ichiro said, "After all, people are more taboo about soul things!"

Hearing Hinata Ichiro say this, Tsunade told Hinata Ichiro about what she had learned about the Yamanaka clan's secret techniques to probe other people's memories - although Tsunade didn't want Hinata Ichiro to casually ask others for information about their secret arts in front of people, Tsunade didn't mind Hinata Ichiro asking him about other people's secret techniques behind him.

"Ichiro, based on what I've learned, the principle of the Yamanaka clan's secret technique of discovering other people's memories is resonance!"

"Resonance!?" Hinata Ichiro asked, puzzled, "Tsunade-sensei, what do you mean by resonance?"

"Ichiro, the memories of the human body are stored in the memory cells of the human brain!" Tsunade explained, "Therefore, if the people of the Yamanaka clan want to explore the memories of others with the secret technique of the Yamanaka clan to explore the memories of others, they must find ways to resonate with the memory cells of other people's brains!"

"In other words, if the memory cells in a person's brain are damaged, then the people of the Mountain Clan will not be able to use the secret technique of the Mountain Clan to detect the memories of others!"

"I see!" Hinata Ichiro said suddenly, "It turns out that the secret technique of the Yamanaka clan to detect the memories of others needs the brain of the person being discovered to be intact!"

"Yes!" Tsunade said, "Ichiro, when the people of the Yamanaka clan resonate with the memory cells of other people's brains, the memories of the memory cells of other people's brains will be displayed in front of the Yamanaka clan one by one because of the resonance!"

"Tsunade-sensei, how do the people of the Yamanaka clan resonate with the memory cells in other people's brains?" asked Hinata Ichiro.

"Ichiro, how to resonate with the memory cells of other people's brains is the core of the Yamanaka clan's secret technique of discovering other people's memories!" Tsunade asked rhetorically, "How can I know the core of the Yamanaka clan's secret technique of probing other people's memories?"

"That's right!" Hinata Ichiro scratched his head and said embarrassedly, "Tsunade-sensei, if you know how the people of the Yamanaka clan resonate with the memory cells of other people's brains, then you will also understand the secret technique of the Yamanaka clan to explore the memories of others!"

Seeing Hinata Ichiro's embarrassed face, Tsunade changed his words and asked, "Ichiro, after clarifying that the principle of the Yamanaka clan's secret technique of detecting other people's memories is to resonate with the memory cells of other people's brains, are you confident that you can develop a ninjutsu similar to the Yamanaka clan's secret technique of detecting other people's memories?"

"Confidence!?" Hinata Ichiro thought for a moment and said, "Tsunade-sensei, I have the confidence to develop a ninjutsu that is similar to the secret art of the Yamanaka clan to detect the memories of others!"

"However, I don't know when we will be able to develop a ninjutsu similar to the secret art of the Yamanaka clan to detect the memories of others!"

"Ichiro, I'm relieved to hear you say that!" Tsunade said.

"Don't worry!?" Hinata Ichiro wondered, "Tsunade-sensei, why do I say that to reassure you?"

"Ichiro, my understanding of the Yamanaka clan's secret technique of detecting the memories of others is what I saw from the manuscript left behind by my second grandfather!" Tsunade said, "After the second grandfather first came up with the principle of the secret technique of the Yamanaka clan to explore the memories of others, he also had the intention of developing a ninjutsu similar to the secret technique of the Yamanaka clan to explore the memories of others!"

"However, the second grandfather finally chose to give up!"

"Tsunade-sensei, why did Kazuma-sama choose to give up?" asked Hinata Ichiro with a surprised expression.

"Ichiro, the reason why the second grandfather chose to give up is because it is quite difficult to develop a ninjutsu that is similar to the secret art of the Yamanaka clan to explore the memories of others!" "In the process of developing a ninjutsu similar to the secret art of the Yamanaka clan to explore the memories of others, if you are not careful, either the developer's spirit will be damaged, or the experimenter's brain will be damaged!"

Speaking of this, Tsunade paused and said, "Ichiro, the Yamanaka clan sacrificed a lot of people when they developed the secret technique of discovering other people's memories!"

"Tsunade-sensei, in the process of developing a ninjutsu similar to the secret technique of the Yamanaka clan to detect the memories of others, I can understand that the brain of the experimenter was damaged, but what does it mean that the developer is mentally damaged?" Hinata Ichiro asked.

"Ichiro, when the memories of the memory cells of other people's brains are displayed one by one due to resonance, the place where they are displayed is the other person's brain!" Tsunade said, "Therefore, if you want to see the image of the memory cells of other people's brain as a result of resonance, you must invade other people's brains!"

"And there are only two ways to invade other people's brains - one is the soul invasion, and the other is the spiritual body invasion!"

"From the perspective of effect, whether it is soul invasion or spirit body invasion, there is only a slight difference in the effect!"

"From a security point of view, it is much safer for a spirit body to invade than a soul to invade!"

"In the case of similar effects, since the invasion of the spirit body is safer than the invasion of the soul, the invasion method chosen by the people of the world is naturally the invasion of the spirit body!"

"However, there is a weakness in the intrusion of the spirit body - that is, the spirit body is easily disturbed!"

"In other words, there is a high possibility that the spirit body that is easily disturbed will collapse!"

Speaking of this, Tsunade paused and continued, "Ichiro, in a certain period of time, a person's spirit is limited!"

"In other words, there is a limit to the number of spiritual beings that can be condensed by a person with the ability to think!"

"If a person's spirit body used to invade another person's brain collapses, then that person will lose a part of their spirit!"

"Tsunade-sensei, when we release ninjutsu, don't we have to lose some of our spirit?" Hinata Ichiro said.

"No!" Tsunade said, "Ichiro, when you release ninjutsu, you lose spiritual energy, not spirit!"

"Spirits are different from spiritual energy!"

"Tsunade-sensei, why do you say that spirit and spiritual energy are different?" Hinata Ichiro wondered.

"Ichiro, ordinary people can't be wrong when they understand spirit as spiritual energy!" Tsunade said, "However, we can't simply understand spirit as spiritual energy!"

"Tsunade-sensei, please be clear!" Hinata Ichiro said.

"Ichiro, the reason why ordinary people can't miscalculate the reason why spirit is spiritual energy can be transformed into spiritual energy!" "Tsunade said, "The reason why we can't simply understand spirit as spiritual energy is that spiritual energy cannot be reversed into spirit!"

Hearing Tsunade say this, Hinata Ichiro asked with a straight face: "Tsunade-sensei, please tell me more about the spirit and spiritual energy!"

Seeing Hinata Ichiro make a request to himself with a straight face, Tsunade looked around him and said, "Ichiro, since the environment we are in now is not suitable for detailing spirits and spiritual energy, therefore, the matter of detailing spirits and spiritual energy should be carried out after returning to the residence!"

Hearing that Tsunade was about to return to his residence and then elaborate on his spirit and spiritual energy, Hinata Ichiro, who was eager to know about his spirit and spiritual energy, felt that he had a cat's claw scratching in his heart.

"Tsunade-sensei, can you briefly talk about spirit and spiritual energy?" Hinata Ichiro asked, looking at Tsunade with a look of hope.

Looking at the hope on Hinata Ichiro's face, Tsunade said: "Ichiro, although the environment we are in now is not suitable for detailing spirit and spiritual energy, it is still okay to briefly describe spirit and spiritual energy!"

"Tsunade-sensei, please speak!" Seeing Tsunade agree, Hinata Ichiro lifted his spirits and spoke.

"Ichiro, the body is the source of the body's energy, and only with the body can there be physical energy!" Tsunade said, "In the same way, the spirit is the source of spiritual energy, and with the spirit can there be spiritual energy!"

"However, there is a difference between the spirit and the body - the enhancement of the body can rely on the supplement of the outside world, but the enhancement of the spirit can only rely on the tempering of the self!"

"Spiritual ......"

"Spiritual energy is a ...... of the spirit"

With Tsunade's brief recounting, Hinata Ichiro has a better understanding of spirit and spiritual energy.

When Tsunade made a brief description of spirit and spiritual energy, Hinata Ichiro suddenly said, "It turns out that this is spirit and spiritual energy!"

"Yes!" Tsunade said, "Ichiro, what I just said is just a general description!"

"When I get back to my residence, I'll explain to you in detail about the spirit and spiritual energy!"

Because of Tsunade's simple narrative just now, Hinata Ichiro's heart at this time no longer has the urgency it used to be.

"Good!" Hinata Ichiro said.

……

——————————

The next day.

Hokage Building.

Hokage's office.

"Jiraiya, I want you to go to XX Island, which is part of the Land of Thunder!" said the third Hokage, looking at Jiraiya in front of him.

"XX Island to which the Land of Thunder belongs!?" Jiraiya asked, "Old man, what are you asking me to do on XX Island under the Land of Thunder?"

"Jiraiya, Kotaro confessed yesterday!" said the third Hokage.

Hearing that the three generations of Hokage said that Kotaro Tanaka confessed, Jiraiya's mind changed and he understood the intention of the three generations of Hokage to let him go to XX Island, which belongs to the Land of Thunder.

"Old man, Kotaro Tanaka said that Nanao is on XX Island to which the Land of Thunder belongs?" asked Jiraiya.

"Yes!" said the third Hokage, "Kotaro said that the Cloud Hidden Ninja Village stored the 'Amber Pure Bottle' that sealed the Seven Tails on XX Island, which belongs to the Land of Thunder!"

"Old man, did you ask me to go to XX Island, which is part of the Land of Thunder, because you wanted me to recapture the Seven-Tails?" asked Jiraiya.

"No!" said the third Hokage, "Jiraiya, I didn't let you go to XX Island, which belongs to the Land of Thunder, to recapture the Seven Tails, but to confirm whether Kotaro's confession is true!"

Seeing that the three generations of Hokage let him go to XX Island, which is subordinate to the Land of Thunder, not to recapture the Seven Tails, Jiraiya's heart moved, and he asked: "Old man, could it be that the Yunyin Ninja Village has deployed heavy troops on the XX Island under the Land of Thunder?"

"No!" the three generations of Hokage shook his head and said, "Jiraiya, the only guards sent by the Cloud Hidden Ninja Village to XX Island under the Land of Thunder are three upper ninjas and ten middle ninjas!"

After learning from the mouth of the three generations of Hokage about the defense force of the Cloud Hidden Ninja Village on the XX Island under the Land of Thunder, Jiraiya's brows furrowed and asked, "Old man, do you suspect that the XX Island to which the Land of Thunder belongs is a trap?"

"Yes!" the third Hokage nodded and said, "Jiraiya, in my opinion, the XX Island to which the Land of Thunder belongs is a trap is very likely!"

"Old man, since there is a high possibility that the XX Island to which the Land of Thunder belongs is a trap, then why do you still let me go to the XX Island to which the Land of Thunder belongs?"

"Jiraiya, I asked you to go to the XX Island belonging to the Land of Thunder, precisely because the XX Island belonging to the Land of Thunder is a trap, and it is very likely that it is a trap!" said the third Hokage.

"What do you say, old man?" asked Jiraiya.

"Although there are many strong people in Konoha, there are very few strong people who can escape from the enemy's trap!" said the third generation Hokage, "Jiraiya, among the few people who are selected, you are the only one worthy of my full trust!"

"Therefore, in the case that I have to confirm that the 'Amber Pure Bottle' that seals the Seven Tails is not on XX Island under the Land of Thunder, I can only let you go to the XX Island under the Land of Thunder!"

"I'm the only one who deserves your full trust!?" After the third Hokage finished speaking, Jiraiya said with a look of surprise, "Old man, wouldn't you embarrass Tsunade by saying that!"

Hearing Jiraiya mention Tsunade, the three generations of Hokage were silent for a while, and then said slowly: "Jiraiya, Tsunade is no longer the Tsunade before!"

"Tsunade is no longer the Tsunade he used to be, ?" Jiraiya asked with a puzzled expression, "Old man, what do you mean by 'Tsunade is no longer the Tsunade it used to be'?"

Speaking of this, Jiraiya's mind turned and asked, "Old man, could it be that Tsunade made a mistake?"