Midsummer is coming to an end, and every evening, there will be a hint of coolness.

With such a high vegetation coverage rate in the Land of Fire, the weather this season is quite pleasant.

For Naruto Uzumaki, the days are not so wonderful.

"The nature of chakra changes, why is it so difficult?"

The feeling that there is nowhere to use the energy is really uncomfortable, even if I have consulted Asma Sarubi who is proficient in air escape and found a way, it is still far from mastery.

The change in the nature of chakra is a practice without the possibility of trickery, and it is quite boring.

Hatake Kakashi naturally let Uzumaki Naruto use the shadow clone to speed up his practice.

At the same time, Kakashi also asked Mizuki for help, wanting to help Sakura practice the concentration technique or other methods to relieve the mental shock caused by Naruto's practice, but Mizuki refused.

"If you care, you will be confused, Kakashi, have you forgotten that the technique of multiple shadows is a completely forbidden technique in itself. You can think that using it to speed up the practice of chakra's nature change is already very dangerous. If it gets worse again Naruto's burden, this risk is multiplied."

"Is it that serious?"

Looking at Kakashi who was a little puzzled, Mizuki who was sitting behind the desk explained helplessly:

"When the shadow clone disappears, it is good to feedback experience and memory, but the fatigue caused by the mental shock will also accumulate. When it is serious to a certain level, the ninja will lose the ability to move or faint. This belongs to the instinct of human self-protection, coma. It is a physiological phenomenon that regulates its own functions, and if you just avoid it, it will have bad consequences!"

"This kind of consequences can vary from serious to serious. If the impact is not large, of course there is no problem, but Naruto is obviously not included in this list!"

"Sakura's physical quality is far inferior to Naruto, but the two have one feature in common, that is, the number of shadow clones is not limited by Chakra, which is a good thing for practice. The concentration technique I taught Sakura is In order to make up for its lack of spirit and body, let it give full play to the advantages of large chakra volume. But I still strictly limit the number of its shadow clones. As you know, Sakura's physical strength is far inferior to Naruto. "

"Naruto's physical strength is very good. If he does his best, he can separate hundreds of shadow clones, and the consequences are also very serious. If there is no protection, it is likely to cause permanent mental damage. "

Seeing that Kakashi still didn't quite understand, Mizuki continued,

"To give an inappropriate example, Sakura can run 10 kilometers, Naruto can run 100 kilometers, and mysticism can make Sakura's running distance tenfold to 100 kilometers, and on Naruto it can double ten times. It is a thousand kilometers, which is also beyond the limit of one's own endurance. What do you think is the difference between the injury caused by running an extra 90 kilometers and the injury caused by running an extra 900 kilometers?"

"Oh, I understand when you say that!"

Hatake Kakashi suddenly realized,

"Physical qualities are different. If Naruto is the one, he will definitely try his best to cultivate. The more shadow clones, the greater the instant damage caused. If this large amount of damage is superimposed in a short period of time, there will be serious consequences."

"That's pretty much what it means. If you want to use Concentration, you must let Naruto control the number of shadow clones, which will lengthen the time period for the damage. Instead, let Naruto let go and wait until he collapses naturally. , it will stop and then recover on its own, which may be faster. Naruto's physical quality and strong will are equivalent to bringing a buffer for physical and mental fatigue, and you don't need to interfere again. Change is not worth the loss!"

And there is another point, with Naruto's chakra volume, the concentration technique is definitely not enough, and a complete soul gathering array must be used.

When Naruto was practicing, the shadow avatar disappeared in an instant, causing mental fluctuations, and then using the sealing technique to interfere, who knows if it will affect the chakra of Namikaze Minato and Uzumaki Kushina in his body?

Mizuki has endured until now without attacking the Nine Tails in Naruto Uzumaki, just because he didn't want to affect the chakra marks in Naruto.

"That's all it takes?"

Kakashi spared his head, and seemed a little dissatisfied with Naruto's progress.

"An S-rank ninjutsu that combines changes in form and nature. Some ninjas can't learn it in a lifetime, and you still pick and choose!"

Mizuki pouted,

"Moreover, it is quite dangerous to hold the destructive wind attribute chakra in your hand. If you use it improperly, it may become disabled."

"Well, I have long expected that ninjutsu practice must be more or less risky!"

Mizuki is not good to say more. It was originally a ninjutsu created by Naruto, and Mizuki is just a return to the original owner. It should not be difficult to learn. The key is to limit the wind escape before Naruto learns the immortal mode. The number of times the sword has been used.

Without the protection of Immortal Mode, this technique would do too much damage to itself.

And its shortcomings are also obvious. Only with the addition of the immortal mode, the control ability and perception are greatly improved, can it be used as a long-range attack ninjutsu of the throwing type. Under normal circumstances, the wind escape - the spiral shuriken It explodes as soon as it leaves the grip.

With Naruto's reflexes and taijutsu level, the chance of hitting the enemy with this S-rank wind escape ninjutsu is too small.

Moreover, in the condition of immortal mode, the long-range throwing attack can also greatly reduce the damage of this extremely destructive ninjutsu to oneself.

"Unfortunately, in this way, I will not be able to catch up with this mission. If the seventh class also participates in the operation to capture the three tails, Naruto will not be able to use this advanced ninjutsu."

"It's enough now. It's enough to prepare a little more military ration pills, maybe it will be useful."

Mizuki doesn't know if Sakura and Hinata have made food pills for Naruto. It stands to reason that Mizuki can't, and most of them don't know how to do it.

As for the others, no one would have the patience to do such a thing. Naruto practiced Feng Dun—the speed of the spiral shuriken slowed down for granted.

The improvement of Naruto's comprehensive strength is obvious. The multi-shadow avatar technique combined with the big jade spiral pill is enough to deal with many challenges. It is really lost. It is enough to use the tail beast transformation. There are several people in the ninja world who can defeat the four-tailed nine. Tail man column strength?

As for the money to buy the military ration pills, most of them have to be paid by Kakashi. He should not lack this money after being single for many years.

However, Naruto hadn't done much quests for three years, so he probably didn't have much savings.