After the three of them had finished lunch and everything was packed up, Mizuki called Haruno Sakura and asked, "Have you finished reading the information given to you?"

"I've finished reading it, Mr. Mizuki." The teaching was finally about to officially begin, and Sakura was looking forward to it.

"That~" Yamanaka Ino said tentatively, "Should I step away?" After all, it is not a good thing to pry into other ninjas' secrets casually.

Mizuki glanced at Ino and said casually, "No need. You won't understand anyway."

This sentence made Ino speechless. Previously, Ino had secretly glanced at what Sakura was studying. It was all a bunch of scribbles and symbols, and she had no idea what it was talking about.

"I've finished reading it, but I didn't understand most of it," Sakura replied.

"It doesn't matter if you don't understand now. I will teach you slowly from now on." Shuimu paused and then asked: "First of all, what do you think chakra is?"

"Chakra?" Haruno Sakura was surprised. Isn't this a basic course in ninja school? Why would they ask this? However, Sakura still answered in a proper manner, "It is a kind of energy produced by the human body controlling the body and mind, extracting and perfectly integrating the two. It is the basis for performing ninjutsu, genjutsu and taijutsu."

Mizuki nodded and said, "You are absolutely right. I remember the knowledge of the Ninja School very clearly, but this standard answer does not actually explain the essential problem."

"How could that be? Isn't that right?"

"What you said is not wrong, but you only told me how chakra is produced and what ninjas usually use it for, but you didn't explain more important things. Just like the sunlight outside, we all know that it comes from the sun, can promote plant growth, and bring warmth to people, but few people can explain clearly what sunlight is and how it works."

These words made Haruno Sakura confused. After thinking carefully, she still had no clue, so she couldn't help but say, "I don't know, Mr. Mizuki. I have never thought about this kind of question before."

"If you want to make a difference in the future, you should think more about these issues."

"Yes, please give me some advice, teacher." Sakura asked humbly.

"What exactly is chakra? I'm sure many people have studied this question, and everyone has their own opinions. But in my opinion, chakra is the bridge between the ninja's soul and reality."

"The soul is connected to reality?" Sakura asked in confusion. She had never heard of this concept before.

"Yes, chakra is the energy formed by the combination of cells and spirit in the body. It is an excellent carrier of personal will. It is the perfect reflection of dreams into reality." At this point, Shuimu asked, "Have you ever thought about it? Why can ninjas do many things that ordinary people can't do, or even dare not think about?"

"Because ninjas have chakra~" Sakura answered subconsciously.

"Yes." Mizuki nodded in affirmation, "As ninjas, most people will subconsciously ignore this thing that builds the foundation of the ninja world."

"Because it's so common, I don't find it strange."

"Actually, this is not surprising. You have to know that the ninja world is not peaceful. Under the pressure of survival, not many ninjas will consider this aspect. Another situation is that there is no need to think about it at all. Some people... For example, Sasuke who has the Sharingan, and the talented Naruto and Gaara, they only need to consider how to give full play to their innate advantages. It is not a problem to become a Chunin or a Jonin. They have a great chance of becoming the Kage of the five major ninja villages."

"Sasuke is fine, but is Naruto that strong?"

"You will know later." Mizuki did not answer directly, "So what I want to say is that they don't need to understand what I am going to teach you. They can't learn it anyway. The right way is to give full play to their strengths. This kind of people only need to be properly taught, and then use chakra to perform ninjutsu by instinct."

At this point, the clever Sakura understood something: "Mr. Mizuki means that if I want to keep up with them, I must learn more fundamental things?"

"Yes, you don't have their innate advantages, but you have a smart mind that they can't catch up with. Maybe someone can teach you some more magical and more suitable ninjutsu to enhance your strength, but I don't know any of these." Mizuki said bluntly, "So, to learn from me, you must understand the knowledge that only high-IQ ninjas can understand. However, first of all, you have to learn this~"

As he spoke, Mizuki stretched out his left hand, circulated his chakra, and a ball of light blue light wrapped around his palm. He then swung it forward, and a sharp blade light flashed. The murderous aura surprised Haruno Sakura who was standing beside him.

Mizuki nodded with satisfaction. Ever since he came back from the Land of Waves, his medical ninjutsu, which was not very good before, has made great progress. He has mastered the chakra scalpel, and can now use the palm magic, which was only half-baked before, quite well. It seems that the mutated curse seal obtained by sacrificing a lot of vitality is still of some use.

"Did you see it clearly?" Mizuki said to Haruno Sakura beside him, "It is basic for ninjas to use ninja tools to fight, but for ninjas with excellent control, sometimes there is a better choice, which is called the Chakra Scalpel."

"Chakra scalpel?" Sakura asked in confusion, "Is it a medical ninjutsu?"

"Yes, after you learn this, I will also teach you more practical palm techniques. Sometimes, medical ninjutsu can be used for more than just saving people. In fact, when it comes to killing people, there are few who are more skilled than medical ninjas."

After saying that, Mizuki took out the scroll containing the Chakra Scalpel and Palm Fairy Technique and handed it to Haruno Sakura.

"I'll give this to you first. You can practice at home."

Sakura took it and put it away.

"By the way, what is your chakra attribute?"

"Water and earth."

"The flexibility of water and the heaviness of earth? No wonder Tsunade taught him to become a violent medical ninja with extraordinary powers."

"That's it for now, now it's time for questions, what do you want to say?"

"Teacher Shuimu, what have you shown me these days? I roughly know about sealing techniques and some knowledge of spells, but these are much more than what I knew before, and are more difficult than deciphering codes. What are these things?"

Hearing Sakura's question, Mizuki thought for a moment and then said as simply as possible: "It is more appropriate to think of it as a hand seal technique on paper. The combination of dozens of hand seals can perform thousands of ninjutsu, and the runes I gave you, most of the effects of which are summarized and verified by me. Although they cannot be guaranteed to be perfect, they can give you a basis for understanding so that you can get started. The combination of these runes can form countless sealing techniques, formation barriers, spells, etc. with different functions. They are the basic tools for a deeper understanding of more ninjutsu in the future."