Looking at the scroll of concentration technique in his hand that Sakura had mentioned and that had problems, Mizuki frowned and thought for a long time.

"Master, is the problem serious?" Sakura asked a little nervously. As a weapon to speed up the practice, it is one of the most important treasures in her hands, and it is also an important link to strengthen the connection with Uchiha Sasuke. If this thing is lost, the impact will be too great.

"Tell me in detail about your last normal use!"

Shuimu's right hand stroked the dense array patterns on the scroll, rubbing them constantly. To ordinary people, it was probably just some beautiful patterns, not much different from the heavenly book, and it was basically impossible to understand. But in Shuimu's eyes, it was not the case...

"This is not accidental damage, but the protection of the Mind Concentration Scroll was forcibly broken."

Seeing Mizuki's serious expression, Sakura said nervously, "About a week ago, I used the scroll normally, just like usual..."

"Who's using it? You or Sasuke?"

"It's Sasuke!" Karin answered somewhat uneasily. After all, this was something Mizuki gave to Sakura. Although it was not clear how he used it on himself, it was obvious that Mizuki gave it back to Sakura in order to strengthen her. Although there was nothing wrong with giving it to Sasuke, it went against the original intention after all.

"What's the difference from usual? Is there anything wrong with Sasuke after this is over?"

"It's not that different." Sakura thought carefully for a while and said, "It's just that Sasuke used more shadow clones than usual..."

"How much?" Shuimu asked.

Sakura nodded in confirmation, "Normally there are about ten Shadow Clones, but that day there seemed to be four or five more than usual. Sasuke said that in the past, he could fully support the training with ten Shadow Clones, so he added a few more because he felt he had the spare capacity."

"About fifteen!" Mizuki nodded to show that he understood. With this number, Sasuke couldn't possibly break the concentration technique at his current level. "Are there any others? What's different after finishing the training?"

"There's nothing different, except that I seemed a little unsteady when I first finished, but it was fine after a while. But when I used the scroll again the next day, there was no reaction."

"Anyone else? Are there any people around? Who has come into contact with you before and after?"

"We are the only team 7 here!"

"Is Shan Zhongfeng nearby?"

"Yes, communicate more with new teammates to deepen your tacit understanding. Kakashi-sensei also said so."

"Has the Mountain Wind ever done anything special?"

Haruno Sakura shook her head and said, "No, I just feel a little unwell. I've been training a little too much, and my face looks a little pale!"

"Understood!"

Mizuki's mind flashed with this handsome boy disguised as a sunny blond, and he was basically sure that it was him who did it. As a master of the family's secret spiritual arts, he must have done something to make the concentration technique derived from the soul gathering array play the role of protecting against mental attacks. Because he didn't know the basic function of the concentration technique, he thought it was just an auxiliary ninjutsu to cooperate with the shadow clone technique. He wanted to take advantage of the opportunity of Uchiha Sasuke's shadow clone to do something to his mind, but he didn't expect to encounter an unexpected interception. Although the concentration technique was broken, it did not cause too much damage to Uchiha Sasuke, but he seemed to be backfired.

"Is it the wind in the mountain?"

What good could this dangerous guy with unknown purpose, who must have an important mission for Shimura Danzo, do if he just attacked Uchiha Sasuke? Mizuki couldn't help but fall into deep thought.

There was no answer for a long time, which made Sakura even more nervous, thinking that something bad had been done.

“Is this difficult to repair?”

"Hmm? Well, it's not that much of a bother. I just remembered something else."

There is no need for Haruno Sakura to know these dark things for the time being.

"Wait here for a while and help me watch the store. I'll go fix it for you."

As he spoke, Mizuki picked up the scroll and turned to walk into the back room which served as a lounge.

It took Mizuki about an hour to completely strengthen the concentration technique that could remove the seal. Its function of calming the internal fluctuations of promotion was secondary, and its main function was to strengthen the defense against external mental ninjutsu attacks.

When Mizuki reappeared with the repaired scroll, he found that business was unexpectedly good.

"Have the return of locals to the village led to more people with strong purchasing desire?"

When Mizuki saw the busy Sakura send off the last customer, half an hour had passed. The morning peak was over, and people could finally have some peace and quiet.

"Take it. Remember to be careful when using it. It can be dangerous if you don't use it properly."

Attribute the incident to a problem of usage and don't let the Team 7 Genin think too much about it for the time being. However, it seems that they have to investigate Yamanaka Fuu's actions and purpose. It would be inappropriate to leave it alone, but Mizuki hasn't figured out how to tell Kakashi.

It is actually quite difficult to investigate this Yamazaki Feng. The actions of the "Root" ninja are quite covert. They can be said to be the Anbu among the Anbu. Only a few of them have names, and the vast majority are mission machines without even a name or self. The only code they use to identify themselves to the outside world is one that can be changed at any time.

As a descendant of a big family in Konoha, Shan Zhongfeng cannot be the same as those ordinary war orphans who were taken in, but his quality is definitely not much different.

Taking the scroll handed over by Mizuki, Sakura unfolded it and looked at it, and asked in confusion: "It seems a little different from before."

"The effects are similar, but a little safer than the previous one."

Shuimu said, "Since you can see the difference, you must have studied the concentration technique. What have you learned?"

Sakura smiled reservedly and said, "It's not really research. The scroll was broken. I looked at it carefully for a few days and tried to fix it myself, but failed. I did find that a part of it was very similar to the illusion - the Sleeping Scene..."

"Oh? It's great that you noticed that."

Shuimu said admiringly, "Things with similar characteristics often have the same functions and effects. Animals with sharp teeth are mostly carnivorous beasts, while animals with smooth teeth and long digestive tracts are mostly herbivores. Animals with wings are mostly able to fly. It is also very similar in sealing techniques. Modules with similar runes have similar functions. The two-way influence of chakra and spirit in Xishuixiang and Concentration Technique are actually of the same origin and come from the same technique. When you finish the learning task, you will start learning more advanced sealing techniques."

After all, Shuimu made his fortune by relying on sealing techniques, so his disciples naturally cannot lag behind in this regard.