The ninja world is not like the previous life, where the body and soul are inseparable. In the ninja world, with chakra as a tool to extend the will, the soul can also get rid of the constraints of a single body to some extent. In this world where the basic rules are not stable, it is not strange that a collection of negative human wills like the tailed beasts are born.

Mizuki, no longer paying attention to the sign at the door, led Sakura into the store.

"Will you be working here for some time?"

"Work?"

"No, it's studying~" Mizuki really wanted to slap himself in the face, he almost let the cat out of the bag.

Sakura nodded and said nothing.

"Do you feel anything different here?" Mizuki asked.

"If you ask me what's different, it seems that the store is a little unusually quiet." Sakura looked at the people coming and going on the street outside the door, but the sound reaching the store was very small.

Shuimu nodded and said, "Your attention and perception are very sharp, which may be related to your excellent chakra control. This will be a very beneficial skill for you in the future."

Without further explanation, Mizuki led Sakura to the back of the counter, revealing a small bookcase that was very delicately hidden. Mizuki pointed at the books and various scrolls inside and said, "Don't touch the ones with red labels. You can only read the yellow ones when I'm here. You can read as much as you want in the other three days." Mizuki took out a booklet and handed it to Sakura, "This is a comparison table and various records I made. Most of the things in it have been verified, but they can't be guaranteed to be absolutely correct. If you don't understand something, you can refer to it. I'll give you time to ask questions in three days."

"Shuimu, is this okay?" Xiaochun was a little uneasy, "Kakashi handed the student over to you, and you just let her learn on her own?"

"I'm watching, don't worry." Shuimu said, "Smart students don't need teachers to worry too much."

"Then I'll leave and come bring you lunch at noon." Xiao Chun was going to work.

"Well, don't forget to bring one for Sakura."

As time went by, after the morning rush hour, the flow of people in the store gradually decreased. Mizuki glanced at Sakura who was working hard. Her focused attitude was worthy of being a genius in study.

Taking advantage of the time, Mizuki also took out the reward given to him by Kakashi, which was the Ninja Dog Summoning Beast Contract inherited by the Hatake family.

As the price for teaching Sakura, Mizuki takes this opportunity to take a closer look at what a real summoning contract scroll looks like.

Touching the cover of the scroll, Mizuki emitted chakra slightly, sensing possible problems inside.

"It's not ordinary paper, it seems to be the skin of some creature."

Spreading out the long scroll, a series of names and fingerprints were revealed. The first one he saw was Hatake Kakashi. As he looked up, he saw a long list of people who were mostly from the Hatake family. At the very end, a summoning array talisman appeared before his eyes.

After studying this spiritual contract for a long time, Shuimu still didn't find anything special in it.

"As expected of a summoned beast inherited from a ninja family, it is much more advanced than the common ones."

The optimization effects of the various runes in it, the spatial perception and the way of connection are much more reliable. Correspondingly, the user's chakra requirements are more stringent. Different chakra amounts and output methods may correspond to different individuals. However, Shuimu still did not find anything valuable.

"Is there really no problem? The contract is fair. It uses chakra to provide the consumption of the summoning. Although it is a bit much, it can be regarded as a reward. From this point of view, it is a model contract of mutual benefit. There are no traps found in the decorative patterns and inscriptions around. They are all very common. Could it be that I am just overthinking?"

Unwilling to give up, Shuimu slowly stroked the surface of the scroll while thinking. Suddenly, Shuimu's hand froze, and he felt the scroll carefully.

"What's this?"

There seemed to be some special patterns, Shuimu hurriedly observed it carefully, and as his fingers gradually rubbed it, some traces that were exactly the same color as the original were discovered.

"This is actually a natural seal rune that comes with the raw material itself. No wonder it can't be found. However, this shape seems familiar. "

After thinking for a while, Shuimu put down what he was holding, walked out of the shop, looked at the sign of Four Seasons Flower Shop, and recalled every detail of how he made it.

"So that's how it is, no wonder." Mizuki finally understood what was going on.

Turning around and walking into the store, Shuimu picked up the scroll again, thought about it, and copied the natural array pattern. Then he checked it several times to make sure there was no missing information before putting it away.

"Although I was worrying too much, the discovery was surprising."

Hidden in this spiritual contract is a rune that is very similar to the function of gathering consciousness that Shuimu has studied. In other words, according to this contract, the summoned beast has the ability to collect the thought fluctuations or spiritual radiation of the contracted person at all times. In theory, this is not harmful to humans. As a person thinks, he will continue to emit some information. Even if there is no processing, these will gradually dissipate in the air. Just like the sun emits light and heat, no matter whether you use it or not, and how you use it, it is there anyway. And the summoned beast seems to be collecting these useless things. In the eyes of ordinary people, this is more useless waste than collecting chakra.

"If they don't have other intentions, then they must have mastered a method to turn waste into treasure. Generally, those who have summoned beasts are either controlled by powerful military organizations like Konoha, or they are secret techniques passed down for hundreds of years by major ninja families. They are all powerful and have been blessed by fate for a while."

Mizuki, who was dizzy with thoughts, stopped thinking. "There are many hidden dangers here. Something that can be written into the contract openly is hidden. I have to study it carefully later to find out what kind of treasure is hidden in this area."

"Teacher Mizuki, this is for you?" A glass of water was suddenly handed over.

"It's Sakura, thank you." Mizuki took it and drank it in one gulp, and immediately felt more energetic.

"You're welcome. I didn't expect the teacher to be like this normally." Sakura said with a smile.

"Oh? So what do you think a teacher should be like? Yelling and yelling like Iruka?"

"No, I just think that Mr. Mizuki is more knowledgeable than I thought." Sakura said quickly, "I looked at the things that the teacher studied, and I can only remember a lot of them. I don't understand most of them."

"So you can still understand a little bit of it?" Shuimu comforted, "It's much better than I thought. Every ninja's personal research has its own characteristics. Without the accumulation of previous knowledge, it's good enough that you know what you are learning."