Naruto: Blade of the Sharingan

"Everyone's gone. Aren't you coming out yet?"

As soon as Uchiha Nagi finished speaking, a gust of wind blew past, and a man, swift as the wind yet traceless, appeared beside him. It was the Wind Hashira, Shinazugawa Sanemi.

"He is my younger brother..."

Shinazugawa Sanemi's face, and indeed his body, was covered in ferocious scars. Some were from battle, but many more were because he often cut himself with his blade to draw blood. His blood, aside from being rare, possessed a special ability: anesthesia. Demons that smelled his blood would fall into a drunken stupor. The more blood he shed, the more severe their condition became. He would even intentionally stain demons with his blood or let them consume it to trick them, a tactic that had proven effective time and again. Unfortunately, it had little effect on the likes of Upper Moon One or Muzan, who were at their peak.

Shinazugawa Sanemi continued, his expression unchanging, "All along, I've only wanted him to be an ordinary person, to marry, have children, and live out a ordinary life. His constitution is rather special; he can't learn Breathing Styles. That's why I objected to him joining the Demon Slayer Corps. After all, fighting demons without being able to use Breathing Styles is undoubtedly suicidal..."

"But he's incredibly stubborn. Even though he can't use Breathing Styles, he still joined the Demon Slayer Corps. So, when he found out about the other training system you brought—ninjutsu and chakra—he started thinking of other ways to become stronger..."

"I have a irritable temper; not many people like me. But I heard them say you prefer equivalent exchange, so..."

Shinazugawa Sanemi looked up at Uchiha Nagi. "If you want to learn Wind Breathing, I can help you avoid many detours..."

Uchiha Nagi remained silent, quietly waiting for him to finish, a slight smile playing on his lips. "Although you look like a hooligan, you're actually a good big brother..."

Shinazugawa Sanemi, who had once been defeated by Uchiha Nagi's single genjutsu due to underestimating him, blushed, a rare occurrence. "Bastard, don't talk nonsense I don't understand. Are you agreeing or not? I was careless in our match that day. If you're not satisfied, let's have another go."

"I agree..." They're both big brothers, so why is the difference between Itachi and this guy so vast...

"Damn it, damn it! Shinazugawa Genya, how can you be so stupid?! He's not related to you in any way! If you want someone to teach you, you have to be thick-skinned! Why did you run off?"

The prideful Shinazugawa Genya punched a large tree again and again. As someone who couldn't learn Breathing Styles, killing demons was indeed more arduous for him than for others. But thanks to his genes, like his Wind Hashira brother, he possessed a special constitution.

That is, he could eat demons—

By eating demons, he could temporarily acquire their constitution and abilities. It was because of this that he had survived the Final Selection. To compensate for his lack of Breathing Styles, he even used a gun as an auxiliary weapon, coordinating it with the Blood Demon Arts he temporarily gained from eating demons, making him quite successful.

That's right, guns existed in this world. Shinazugawa Genya had obtained a double-barreled firearm that could hold six bullets. He wielded a Nichirin Blade in one hand and the firearm in the other.

"Hey, hey, don't be so dejected. I..." Zenitsu had just approached when Genya cut him off.

"Damn it, are you here to laugh at me? Huh?" Shinazugawa Genya viciously grabbed Zenitsu by the chest, pinning him against a large tree.

"Mmph~ I can't breathe... huff~ huff."

"Hmph!" After releasing Zenitsu, Shinazugawa Genya turned and walked away.

Once freed, Zenitsu gasped for air, his eyes rolling back. This guy's temper was truly explosive.

"I wasn't finished! I came to tell you that Nagi-aniki wants you to train with us at his place tomorrow morning..."

Huh?!

Shinazugawa Genya, who was halfway down the path, suddenly stopped. He turned and quickly ran back, once again grabbing Zenitsu's clothes excitedly. "You're not lying to me, are you? Is what you're saying true?"

"Mmph~ Let go! It's true! I can't breathe..."

Shinazugawa Genya released Zenitsu again. Zenitsu's eyes rolled back; the guy's strength was just too much...

A faint apology, like the buzz of an ant, reached him. "Sorry—"

"Hm? What did you say?" Zenitsu then realized the other boy was apologizing.

"It's nothing, don't worry about it..."

Before he could finish, Shinazugawa Genya had already left, without any hesitation. Zenitsu scratched his head. "What a weirdo..."

In the sunlit forest, Shinazugawa Genya's figure ran swiftly. Zenitsu's ears picked up a sense of joy emanating from him.

The next morning, another figure joined the daily training: Shinazugawa Genya, along with Zenitsu and little boar Inosuke, making a group of three, as Tanjiro had not yet returned.

Uchiha Nagi sighed. No matter where you are, only the thick-skinned get the meat. Genya is thin-skinned and prideful. Actually, if he had dared to be thick-skinned and stayed yesterday, Uchiha Nagi wouldn't have chased him away. After all, herding one sheep is the same as herding three.

Uchiha Nagi was very curious about Shinazugawa Genya's constitution, which allowed him to eat demons and temporarily gain their energy and Blood Demon Arts. Could he be another Shin?

Shin was one of Orochimaru's subordinates, fervently obsessed with the Sharingan. His body was very special, able to fuse with Kekkei Genkai without rejection. Danzo's arm, which fused First Hokage cells and Sharingan, used Shin's cells as a medium. He later died in Boruto...

However, Shinazugawa Genya's constitution was clearly even more special. Regardless, Uchiha Nagi planned to study it.

"Same as usual. Hmm~ Tanjiro isn't here today, so it'll be you three. Here are two bells. You three will try to take them from my Shadow Clone. Whoever gets one gets to eat." Uchiha Nagi, with a mischievous streak, took out two bells.

Then, he created a Shadow Clone to train with them, while his main body focused on his own cultivation.

"Eh? But there are only two bells. What about the person who doesn't get one?" Zenitsu asked curiously.

"Naturally, whoever doesn't get one doesn't eat. Special training naturally needs a little incentive. So, prepare yourselves. You can discuss tactics if you want. Hmm~ You have half an hour. We start at nine o'clock sharp—" Uchiha Nagi said, looking at the time.

This was a problem Uchiha Nagi had noticed. Because they hadn't experienced battles on the scale of the Ninja Wars, their combat awareness wasn't very high. Whether alone or in a group of three, their coordination was entirely based on chance; they had no squad-based tactics or synergy. And good squad coordination and tactics could sometimes yield excellent results, especially against solitary demons.

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