Naruto: Copy System

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"Shin, that Jutsu is incredible! I want to learn it!"

Kushina's eyes sparkled as she witnessed the destructive power of Wind Style: Rasenshuriken.

Shin shook his head. "Kushina, it's not that I don't want to teach you, but you're not ready for this Jutsu yet."

"Kushina, S-rank Jutsu are beyond your reach for now. They're not easy to learn," Tsunade added.

S-rank Jutsu were powerful, but also difficult to master. The Rasenshuriken was no exception; it was an S-rank forbidden Jutsu.

Training in the Rasenshuriken was risky; you could easily injure yourself.

"The Rasenshuriken transforms Wind Release Chakra into microscopic needles that attack the opponent's cells directly. Even if it doesn't kill them, it can cause paralysis."

"But it has drawbacks. If you lose control during training, you can injure yourself. And the incomplete Rasenshuriken can't be thrown, so you risk getting caught in the blast."

"It's best to use Shadow Clones to train in this Jutsu."

Shin explained the intricacies of the Rasenshuriken.

He had used Shadow Clones to develop and refine the Jutsu before attempting to use it himself.

But if Kushina used Shadow Clones to train, she would run out of Chakra quickly.

She wasn't ready for this Jutsu yet.

"The Chakra consumption is immense. Even with your large reserves, Kushina, you can't handle it. Let's wait until you're older."

"Fine."

Kushina wasn't too disappointed.

"But Tsunade can learn it." Shin looked at Tsunade.

Tsunade had enough Chakra. As a Senju, she also possessed the Sage Body. While it wasn't as potent as Shin's, her Chakra reserves were still massive.

Despite being an elite Jōnin, her Chakra volume was several times greater than Hiruzen's.

A Shinobi with the Sage Body rarely had Chakra issues. And those with the Perfect Sage Body had Chakra overflowing.

"You're going to teach me this Jutsu?" Tsunade looked at Shin, surprised.

This wasn't some common Jutsu; it was an S-rank! Was this kid really interested in her?

"If you don't want to learn it, that's fine. It's just an S-rank Jutsu. Nothing special to me."

Shin shrugged nonchalantly.

He wasn't boasting. The Rasenshuriken was powerful, but there were stronger Jutsu out there.

"Of course I want to learn it! It's an S-rank Jutsu!"

Even Tsunade couldn't resist the allure of an S-rank Jutsu.

"In that case, call me Shin-sensei." Shin grinned.

"You're looking for a beating!!" Tsunade raised her fist playfully.

Shin dodged easily. Tsunade's punches were slow to him.

"Damn it."

Tsunade was annoyed that she couldn't land a hit on him.

"Come on, Tsunade. This is a great opportunity. One 'sensei' for an S-rank Jutsu."

Kushina egged her on.

"Mikoto, don't you think so too?" Kushina nudged Mikoto.

"Yes, I think Tsunade-sensei is getting a great deal," Mikoto agreed with a smile. She and Kushina were enjoying this.

Tsunade snorted. An S-rank Jutsu for calling this brat 'sensei'? No way.

"Shin-sensei."

Well, it seemed no one was immune to the allure of a good deal, not even Tsunade.

Shin was surprised. He had been joking. He hadn't expected her to actually call him 'sensei.'

Knowing Tsunade's personality, this was hard to believe.

"What? Do you want to get punched?"

Tsunade blushed under their gazes. Calling Shin 'sensei' felt like a loss of dignity.

"Since you've made such a sacrifice, Tsunade, I'll teach you the Rasenshuriken," Shin said with a grin.

Tsunade gritted her teeth. She felt like kicking herself. Why had she called him 'sensei'?

If she could turn back time, she would take it back and punch Shin instead.

Seeing her anger, Shin coughed and started explaining the key points of the Rasenshuriken.

"So I need to learn the Rasengan first?"

"Yes, the Rasengan is the Basics of the Rasenshuriken. You can't use the Rasenshuriken without mastering the Rasengan," Shin confirmed.

He had already taught Tsunade the Rasengan, but she hadn't mastered it yet. It wasn't that difficult, though. She should be able to learn it in a few days.

"By the way, Tsunade, as the Senju Clan princess, you shouldn't be lacking in S-rank Jutsu, right?"

"Who said I wasn't? I could get my hands on Wood Release S-rank Jutsu, but the other S-rank Jutsu are sealed in the Forbidden Scroll by my grandfather."

Tsunade explained.

She couldn't use Wood Release. Besides Hashirama, no one else could.

And the other S-rank Jutsu developed by Tobirama, like the Flying Thunder God Jutsu and the Edo Tensei, were sealed in the Forbidden Scroll.

Even if they weren't, she might not be able to learn them.

The Flying Thunder God Jutsu required a talent for Space-Time Ninjutsu, and the Edo Tensei was a complex forbidden Jutsu.

"By the way, Shin, don't reveal this S-rank Jutsu to anyone," Tsunade said seriously.

S-rank Jutsu were rare and coveted by even Kage-level Shinobi.

Revealing it could be dangerous, especially with Danzō around. She didn't trust him not to try and steal it.

"Don't worry, I won't reveal it. And most people wouldn't even force me to use it."

Unless something unexpected happened, Shin wouldn't be facing any truly strong opponents for now. And against ordinary Genin, Chunin, or even Jōnin, he wouldn't need the Rasenshuriken.

It was much faster to just kill them with his sword.

Tsunade nodded, reassured.

"If only Nawaki was half as strong as you, I wouldn't have to worry. I wonder how he's doing with Orochimaru."

At that moment, a certain boy who was shoveling manure sneezed.

"Is someone thinking about me?" Nawaki wondered, then continued his task.

As for why he was shoveling manure, Orochimaru had accepted a mission to clean up a farm, which included cleaning up the animal droppings. It was certainly an interesting mission choice.

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