A certain scientific Naruto.

"Ninjutsu should be learned in a systematic way, so the next ninjutsu is an upgraded version of the shadow clone technique, the multiple shadow clone technique." Kushina scratched her hair, and then struggled to come up with the next A ninjutsu that should be taught to Hagoromo.

"Multiple Shadow Clone Jutsu. Although it is an A-level ninjutsu, it is only an enhanced version of Shadow Clone Jutsu. It should not be difficult to practice."

Yuyi silently glanced at Kushina, and said that the practice of multiple shadow clone technique is not very difficult, but it is a forbidden technique, and it will consume tons of chakra, okay? Besides, with a physique like my own, basically The upper shadow clone technique is definitely enough, and his fighting style will not be useful for the multiple shadow clone technique.

But since Kushina wants to teach him, he should learn it honestly. Anyway, as long as he controls the amount of chakra well, he should be able to avoid the danger brought by this technique.

Because the multiple shadow clone technique needs to allocate a large amount of chakra at one time, if the control is not good, it will cause injury to the caster, but Yuyi does not think that such a problem will occur with his own control ability.

But he still said one more thing, "Well, Teacher Kushina, the multiple shadow clone technique is a forbidden technique, right? Is it okay to leave it to me?"

"Multiple invisibility is indeed a forbidden technique, but I want to teach you, do you think the third generation will have any objections?"

Yuyi really wanted to say, Mr. Kushina, you misunderstood me. What I said was not about Naruto's permission or not. I mean, this ninjutsu will not kill me, right?Everyone's worries are different, okay?

Fortunately, Kushina continued to explain, "Although this ninjutsu is a forbidden technique, the scope of the ban is only for ninjas below the top ninja level. It is nothing to ninjas at the top ninja level. According to my perception , I think your chakra level is still so-so, so it’s no problem, probably.”

Hey, well said, what is the meaning of the last one?Is it still a risk?

The difference between the multiple shadow clone technique and the shadow clone technique lies in the amount of chakra running in the meridian. If the chakra amount required for the shadow clone technique is 1, then the chakra amount of 3 is required to separate three clones at the same time. It is easy to understand, if the clones that are separated at the same time are only single digits, it is not too difficult, nor is it dangerous.

But on the contrary, if you want to create clones with more than ten people, you can imagine the difficulty. If you want to create clones with more than a hundred people and a thousand people... Only bugs like Uzumaki or Senshou can do it. Yes, although his chakra level is good, it is compared with ordinary people. If the object of comparison is changed to whirlpool, then he must be silently injured.

"Looking good..." Kushina made a demonstration for Yuyi again.

And Yuyi is a person who knows how to choose. When he practices the multiple shadow clone technique, the number of clones at a time will never exceed 5. Under such a limited situation, he can be considered to have mastered this technique.

"Very good, you are very calm." Kushina praised Yuyi's shoulder, "Well, I will teach you another ninjutsu today. Of course, this is also the last ninjutsu of today, or the system of avatar jutsu. Yes, the name is Shuriken Shadow Cloning Technique."

This ninjutsu should be owned by the third generation of Hokage. Is it really okay to be so unscrupulous?Yuyi couldn't help being suspicious.

In fact, there is a problem, but it is placed on ordinary people. If it is placed on Kushina, there is no problem at all.

In fact, Kushina is a little guilty at this meeting. What she is guilty of is not violating the copyright of the third generation, but the speed at which Yuyi learns ninjutsu. If she does not limit it, these ninjutsu that she has mastered may soon be learned by her disciples Well, when the time comes, there is nothing to teach, how sad it is.

With such a student at the booth, Jiu Xinnai was not only lucky, but also a bit tragic.

But she thought of Kakashi who Minato had been praising, humming, gritted her teeth, she still had to teach Yuyi.

In fact, Yuyi is already very satisfied. Come out to Kushina, and that teacher will teach him three advanced ninjutsu every day?

Of course, with his current amount of chakra, it is not enough for him to fully display too many advanced ninjutsu in battle, but because of his curiosity, it is difficult for him to give up the pursuit of advanced ninjutsu.

The higher the level of ninjutsu, the more mysterious it is, and the more attractive it is to Yuyi.

In this way, Kushina took Yuyi to practice while completing her work. At the same time, sometimes because of Hokage's face and constant persuasion, she would take Yuyi to do some low-level tasks of catching cats and dogs.

Time flies, and before you know it, it has been three months since Yuyi graduated from the ninja school. The graduates of the same period have already gone to the battlefield with their leading teachers. Yuyi even feels that many of them have already sacrificed. But he himself has never even stepped through Konoha's gate.

In this sense, he perfectly fulfilled his mission as a "toy" unconsciously.

…………

"Hey, Teacher Kushina, you seem to be quite happy today. You don't have the frowning look before." Yuyi said to Kushina in front of him. In fact, because the development of ninjutsu was not going well, Nai has been irritable for several days, but today her mood suddenly turned bright, which is indeed a bit strange.

After all, after getting along for three months, Yuyi already knows Kushina's personality very well.

"Is there any new progress in the development of the four-image seal technique in Mofeili?"

That's right, in the past three months, Yuyi has changed from a rookie to a professional assistant who can assist Kushina in the development of S-level forbidden techniques.

Kushina was in charge of the design of the sealing technique, and Yuyi was in charge of the calculation of the data. The two cooperated very well.

The four-element seal technique can be said to be an extreme variant of the four-element seal. This is an S-level mission sent by Konoha's seal research institute. The original requirement for this technique is to kill the enemy together. When the ninja is about to die Activate this technique to seal the surrounding enemies together.

But Yuyi put forward a different point of view. He believed that this greatly limited the scope of use of this technique. If it could be used on a scroll instead of a human body, it would become an extremely aggressive sealing technique.

Kushina felt that the disciple's point of view was very interesting, and the requirements of this S-level task were too low on her level, so she improved this ninjutsu according to what Yuyi said.

However, the difficulty of this ninjutsu was only reflected after the real start.

So Yuyi had to face the crazy Kushina often.