Samui and Atsui

Oguri Hayashi didn't continue with the playful teasing.

Because he knew teaching them Ninjutsu wouldn't help them; it would harm them.

If they learned any of the techniques from the Book of Thunder, the Cloud Ninja wouldn't let them go.

After a bit of teasing, Oguri Hayashi resumed his own training. The Book of Thunder contained more than just the Lightning Release Armor; there were also powerful techniques like Storm Release, which was formed from the dual chakra natures of Lightning and Water, or Lava Release, formed from Lightning and Earth.

Essentially, all the variations of Lightning Release were within its pages.

Of course, more importantly, it contained all the advanced Lightning Release Ninjutsu, recorded in meticulous detail.

These were techniques that even Konoha didn't possess, techniques unknown to Konoha's Ninja.

For example, there was Lightning Release: Black Panther, which possessed both physical form and electrical attack capabilities; Lightning Release: Violent Torrent, similar to Chidori; and Taijutsu: Hell Stab Four-Finger Hand. As for Rank B and C Ninjutsu like Lightning Clone and Earth Run, there were countless others.

The Book of Thunder was the culmination of the Land of Thunder's Ninja continuously developing new Ninjutsu and recording them, representing the collective efforts of Kumogakure.

It was also a clear path for Ninja with Lightning Release chakra.

Oguri Hayashi diligently memorized the concepts and hand seals for these Ninjutsu. He had no intention of practicing them for the next three days, and he was prepared to abandon the scroll and flee if he were discovered.

However, the only good news was that he had already mastered the Lightning Release Body Cultivation Technique. He had reliably reached the High Ninja level in Taijutsu, meaning he wouldn't be defeated in a single move even by Dodai or the future Fourth Raikage.

He finally possessed the ability to protect himself in this chaotic era.

As he was forming hand seals and recording the advanced Lightning Release Ninjutsu, the little blonde girl beside him spoke.

"If I'm willing to learn, will you teach me?" she asked respectfully, kneeling before Oguri Hayashi.

Stopping his hand seals, Oguri Hayashi turned to her with a puzzled expression. "Do you know what consequences learning this will have for you?"

"No, you don't," Oguri Hayashi answered his own question.

"This is a secret technique of the Cloud Ninja, the Book of Thunder. Any Ninja who attempts to learn the Ninjutsu within without the Raikage's permission will be ruthlessly eliminated by the Raikage."

"If you are discovered learning this, you will have no place to stay in Kumogakure."

His words made the little blonde girl's face turn pale, but she remained calm, or rather, indifferent, kneeling before Oguri Hayashi, yet speaking with great determination: "I want to learn."

"Oh?" A child of seven or eight could already be a Genin. This meant Kumogakure wasn't desperate, otherwise, she would already be on the battlefield. She at least understood what awaited a rogue ninja if discovered.

Yet, she still chose to learn these things. What was she thinking?

He couldn't help but feel a sliver of curiosity towards this little girl.

"Why?"

He asked.

"Because it's cool." For ordinary people, this wouldn't be a significant reason, something they wouldn't risk their lives for. But for a child, it was perfectly logical, completely natural.

Oguri Hayashi was not a normal person. If he were, facing a precarious existence, he would have long gone mad. But he remained silent, survived, concealed his intelligence and sharpness, and disguised himself as a normal person.

He wasn't normal. Normal people wouldn't take so many insane actions.

In the world of Naruto, due to his prolonged suppression of himself, Oguri Hayashi's mental state differed from that of an ordinary person.

Normally cold, upon hearing Samui's words, he slowly grinned. "A good answer!"

"But no, I still can't teach you the advanced Lightning Release Body Cultivation Technique, but..." Before Samui's disappointed gaze could fully register, Oguri Hayashi continued, "I can teach you the foundational Taijutsu."

Compared to the obvious nature of Lightning Release, Taijutsu was less conspicuous. The superficial aspects were merely increased strength, greater power, and enhanced endurance.

However, compared to the Taijutsu training of this world, his [My Style Secret Technique] was hundreds of times more advanced than the crude physical training methods of this world.

Coupled with the physical constitution of the people in this world, he was eager to see how strong the Ninja he cultivated would become.

"If you want to learn my Nintaijutsu, you must act as my inside source and relay information about Kumogakure to me. This is dangerous work," he told Samui.

Oguri Hayashi could read every subtle shift in Samui's expression. He saw her firmly reply, "Okay."

Interesting. This girl was truly interesting.

For him, there weren't many interesting things left in this world. Growing stronger was one, and the Reincarnators who had descended were another. As for others, perhaps it was watching the original plotline of the world slowly unfold, seeing the characters from his fading memories appear before him one by one.

But now, it seemed there was one more interesting thing.

Raising? Cultivating? Regardless, he needed to build his own force to observe the dynamics of the entire Ninja world.

This was a spur-of-the-moment decision triggered by Samui's request.

He wasn't a god, after all, and couldn't foresee everything. But his greatest strength lay in his excellent adaptability.

Since Samui had made the offer, he naturally couldn't refuse. She was taking a risk, so he had to provide her with a reward commensurate with that risk.

For example, My Style Secret Technique.

"You over there, kid, come here too. Since your sister is becoming my spy, you can't escape either," Oguri Hayashi beckoned to Atsui.

Atsui, who was frying tamagoyaki, paused. He nodded, unsure how the situation had escalated to this point.

However, with both their parents gone, Atsui was very naive. Since his sister had agreed, he didn't mind.

He brought the tamagoyaki and rice to Oguri Hayashi, placing them before him.

"Please eat," he said, looking bewildered.

"Mm, next time, remember to make your own food too," Oguri Hayashi ordered the seven-year-old child as if it were the most natural thing in the world, a truly monstrous act.

And so, the martial arts training for the two siblings slowly began.