Naruto: Modern Science in Naruto

---

"Jutsu should be learned systematically, so for the next jutsu, how about a more advanced version of Shadow Clone Technique, Multiple Shadow Clone Technique?" Kushina scratched her head before painstakingly figuring out the next jutsu to teach Haori.

"Multiple Shadow Clone Technique. Although it's an A-rank jutsu, it's just a strengthened version of Shadow Clone Technique. The difficulty of practicing it shouldn't be too high."

Haori silently glanced at Kushina. He thought to himself, "The difficulty of practicing Multiple Shadow Clone Technique isn't high, but it's a forbidden jutsu, and it consumes a ton of chakra, ok? Besides, someone like me with this kind of body basically has enough with just Shadow Clone Technique. My fighting style doesn't need Multiple Shadow Clone Technique."

But since Kushina wanted to teach it to him, he obediently learned it. After all, as long as he controlled his chakra amount, he should be able to avoid the dangers of this jutsu.

Multiple Shadow Clone Technique requires distributing a large amount of chakra at once, so if you don't control it well, it could injure the user. But Haori didn't think that would be a problem with his level of control.

He still said, "Um, Teacher Kushina, Multiple Shadow Clone Technique is a forbidden jutsu, right? Is it alright to teach it to me?"

"Multiple Shadow Clone Technique is indeed a forbidden jutsu, but I'm going to teach you. Do you think the Third Hokage will have a problem with that?"

Haori really wanted to say, "Teacher Kushina, you're misunderstanding me. I wasn't asking about whether the Hokage would allow it or not. I meant, will this jutsu kill me? We're concerned about different things, okay?"

Luckily, Kushina continued to explain, "This jutsu, while forbidden, is only forbidden for ninjas below the Jonin level. For Jonin-level ninjas, it's nothing. Based on my perception, I think your chakra levels are pretty good, so it should be fine, probably."

"Hey, hey, you were doing so well, and then you added "probably" at the end! What do you mean? Maybe there's still a risk?"

The difference between Multiple Shadow Clone Technique and Shadow Clone Technique is the amount of chakra flowing through the pathways. If Shadow Clone Technique requires 1 unit of chakra, then simultaneously creating three clones would require 3 units of chakra to flow through those pathways while forming the hand seals. This is easy to understand. If you are only creating a single-digit number of clones at a time, it's not too difficult, and it's not dangerous.

But conversely, if you want to create ten clones or more, the difficulty can be imagined. If you want to create hundreds or thousands of clones... only a bug like an Uzumaki or a Senju could do that. Haori couldn't dream of it. His chakra reserves were good, but that was compared to ordinary people. If you compared him to an Uzumaki, then he would definitely be on the receiving end of injuries.

"Watch closely…" Kushina demonstrated again for Haori.

Haori was a very pragmatic person. When he practiced Multiple Shadow Clone Technique, he never created more than five clones at a time. Under such limitations, he could say he had mastered the technique.

"Good, you're very composed," Kushina patted Haori on the shoulder and praised him. "Let's do this. I'll teach you another jutsu today. Of course, this will be the last jutsu for today. It's still from the clone technique system. It's called Shuriken Shadow Clone Technique."

This jutsu was probably the copyright of the Third Hokage. Was it really okay to be so brazen? Haori couldn't help but doubt it.

In fact, there was a problem, but that was if it were an ordinary person. If it were Kushina, there was no problem at all.

Kushina was actually a bit uneasy. She wasn't uneasy about violating the Third Hokage's copyright. She was uneasy about Haori's speed of learning. If she didn't limit him, the jutsu she knew might be learned by her student very quickly. What if she had nothing left to teach? That would be so pathetic.

Having a student like this, Kushina was no longer just feeling lucky. She was starting to feel a bit scared.

But then she remembered Kakashi, whom Minato had always praised. Hmph, she gritted her teeth. She had to keep teaching Haori.

Actually, Haori was already very satisfied. Besides Kushina, what other teacher would teach him three advanced jutsu every day?

Of course, with his current chakra reserves, he couldn't fully utilize too many advanced jutsu in battle. But his curiosity made it hard for him to give up pursuing advanced jutsu.

The more advanced the jutsu, the more mysterious it was, and the more Haori was drawn to it.

(ShixT9: Waiting for Edo Tensei)

And so, Kushina both trained Haori and completed her work. Sometimes, due to the Hokage's face and constant persuasion, she would also bring Haori on some low-level tasks like catching cats or chasing dogs.

Time flew by, and unknowingly, three months had already passed since Haori graduated from the Ninja Academy. His classmates had already joined their team leaders and gone to the battlefield. Haori even heard that many of them had already died, but he hadn't even left the gates of Konoha.

In that sense, without realizing it, he had perfectly fulfilled his mission as a "toy."

…

"Huh, Teacher Kushina, you seem really happy today. You don't look as down in the dumps as before." Haori said to Kushina in front of him. In fact, Kushina had been in a bad mood for several days because the development of the seal technique hadn't been going well. But today, her mood had suddenly brightened, which was a strange occurrence.

After all, after three months together, Haori knew Kushina's personality well.

"Could it be that there's new progress in developing the Four-Symbols Sealing Technique?"

That was right. Over the past three months, Haori had transformed from a complete novice to a professional assistant who could help Kushina develop S-rank forbidden jutsu.

Kushina was in charge of the seal technique design, while Haori was responsible for data calculations. They were forming a great team.

The Inner Four-Symbols Sealing Technique was a variation of the Four-Symbols Sealing Technique. It was an S-rank mission assigned by Konoha's seal research institute. The initial requirement was that the technique be used to die together with the enemy. When a ninja was about to die, activating this jutsu would seal all the surrounding enemies.

But Haori proposed a different perspective. He argued that it greatly limited the range of the jutsu. If it could be used on a scroll instead of a person's body, it could become an incredibly offensive sealing technique.

Kushina thought her student's perspective was interesting, and the requirements for this S-rank mission were too beneath her standards. So she decided to modify the technique according to Haori's suggestions.

However, the true difficulty of the technique became apparent when they actually started working on it.

So, Haori had to constantly face a frantic Kushina.

---