Naruto: Blade of the Sharingan

"Remember, come at me with the intent to kill to get these bells~" Uchiha Nagi finished, then waved his hand casually, his main body departing, leaving behind the Shadow Clone holding the bells.

"Let's just fight! What are tactics? Are they tasty? I'll take both bells! I want to eat two lunches, gahahahaha~~" Little boar Inosuke drew his twin blades and was about to charge.

"Idiot, don't rush in—" Zenitsu hurriedly pulled him back. "Tactics! We need to use some tactics..."

"Hmph~ I agree, no need for tactics. Whoever snatches them, gets them. Both bells are mine," Shinazugawa Genya said, pulling out his gun and blade.

"Bastard, both are mine! Hahahaha, I'm eating two lunches~" Inosuke brandished his long swords and, with a Beast Breathing move, charged forward.

"As expected~" Uchiha Nagi sighed. Just as he thought, they started fighting without any discussion or cooperation. He wondered if Kakashi had similar headaches when teaching his students.

"Beast Breathing, First Fang: Pierce!"

Facing the charging Inosuke, Uchiha Nagi's Shadow Clone remained unruffled. Just as Inosuke was about to strike, the clone used the Substitution Jutsu. Poof!

After a puff of smoke, it turned into a block of wood, which Inosuke sliced in half.

"Huh? Where'd he go? Where's he hiding? Beast Breathing, Seventh Form: Spatial Awareness!" Inosuke closed his eyes to sense his surroundings, then opened them and laughed towards a certain direction. "Haha, found you! Huh?!"

Inosuke was dumbfounded. Uchiha Nagi wasn't standing on land but on the surface of a small nearby lake, cheerfully watching the three of them.

"Cheating! I protest! We can't float on water—" Zenitsu, who had followed, was also stunned and immediately protested loudly.

Although Breathing Styles were powerful, they didn't grant the ability to stand on water without sinking...

Shinazugawa Genya, however, raised his firearm and fired a shot at Uchiha Nagi on the lake. The bullet was, of course, fast, but Uchiha Nagi's Shadow Clone had also been imbued with some eye power and had its Sharingan activated. Before Genya's bullet even left the muzzle, Nagi had already predicted its trajectory with his powerful dynamic vision and dodged it.

Genya was astounded. It was the first time he had seen someone dodge a bullet. Unwilling to give up, he fired two more shots, but the Shadow Clone dodged them with a cheerful expression.

"If you want to defeat me, you must be prepared to face different situations on any battlefield. Once you can adapt to my fighting style, you'll be able to quickly adapt to any unknown subordinates Muzan might have in the future."

"Ox - Monkey - Hare - Rat - Boar - Rooster - Ox - Horse - Rooster - Rat - Tiger - Dog - Tiger - Serpent - Ox - Ram - Serpent - Boar - Ram - Rat - Water Release - Monkey - Rooster - Dragon - Rooster - Ox - Horse - Ram - Tiger - Serpent - Rat - Monkey - Hare - Boar - Dragon - Ram - Rat - Ox - Monkey - Rooster - Water Release - Rat - Boar - Rooster."

Uchiha Nagi unhurriedly finished forming over twenty hand seals on the lake's surface. "Water Style: Water Dragon Bullet Jutsu!"

An enormous water dragon soared into the air from the lake. Because there was a water source, the Shadow Clone didn't expend much chakra, so Nagi specifically gave them an extra-large version.

Faced with the sudden torrent of water, the three "tenth-level" youths had no power to resist and were swept away.

Of course, it wasn't without resistance. They each used their Breathing Styles to cut through the water flow, but the subsequent massive waves scattered them completely.

"Indeed, they are at a significant disadvantage when fighting against a different system," Uchiha Nagi remarked with a sigh.

Because eliminating demons required getting close to sever their necks, Demon Slayer Corps members had always been highly specialized—all close-combat types with strong taijutsu. However, against large-scale ninjutsu attacks, they had no way to defend.

Conversely, large-scale ninjutsu attacks were mostly ineffective against opponents like Muzan. Besides wasting one's own chakra, they had virtually no effect. If even a severed arm could regenerate in a second, what use was ninjutsu? Unless it was S-rank ninjutsu, sealing jutsu, the Mutual Multiplication Explosive Tags, or Jiraiya's Sage Art: Goemon, S-rank ninjutsu on par with Amaterasu—immensely powerful, capable of severely injuring them or burning them to ash, leaving not a single cell behind.

However, ninjas were also highly specialized: high offense, low defense. If ninjas below Kage level were to fight the Twelve Kizuki, they would likely be defeated by having their chakra completely depleted.

"However, there is one ninjutsu that is rather special: Wind Style: Rasenshuriken. That jutsu could destroy every cell of Kakuzu—" Uchiha Nagi recalled. He realized that the properties of the Rasenshuriken were actually quite suitable for killing demons. It might even become a ninjutsu capable of killing them without needing to sever their necks.

"Damn it~ Where did my boar head go?" A drenched little Inosuke climbed up from the ground, looking left and right. He couldn't find his boar head mask anywhere. Just then, Uchiha Nagi approached. Inosuke quickly closed his eyes; from multiple training sessions, he knew that looking into Uchiha Nagi's eyes would immediately trap him in a genjutsu.

"Earth Style: Headhunter Jutsu." What appeared in front of Inosuke was just a dummy, a mere clone jutsu. The Shadow Clone had already burrowed underground. The Clone Jutsu was one of the Three Basic Jutsu, an intangible clone. It was tested in the Genin exams; Naruto couldn't graduate because he failed it.

"Without your Nichirin Blade and your body immobilized, you can't escape even with Breathing Styles, right~"

Uchiha Nagi finished speaking and cheerfully went off to deal with the other two.

"Damn it! Wait, you imposter! Let me out, and we'll fight again—" leaving behind only Inosuke's head, still yelling.

Meanwhile, the other two, scattered by the flood, had ended up in different places: one rushed into the woods, the other slammed into a rock.

"Damn it, I've never encountered this kind of fighting style before. So this is ninjutsu? It's on par with Blood Demon Arts," Shinazugawa Genya said, patting the muddy water off his body as he stood up. However, his face was filled with even more excitement and fighting spirit. As someone who couldn't use Breathing Styles, if he could learn these techniques, he could become stronger and find another way to catch up to his powerful older brother.

"So, I must pass today's assessment~" Shinazugawa Genya secretly resolved.

Elsewhere, Zenitsu, still wringing out his muddy clothes, became Uchiha Nagi's second target for today's special training.

Suddenly, Zenitsu seemed to hear something. As soon as he looked up, he saw a pair of red eyes.

"Demonic Illusion: Hell Viewing Technique."

Zenitsu instantly fell into the world of genjutsu:

He married Nezuko-chan, then became a father, and finally, they had a baby boy. Zenitsu excitedly took the baby, only to see that its face looked exactly like Inosuke's.

Zenitsu felt dizzy..."Hahahaha, as expected of my child! He really does look just like me!"

Inosuke appeared before him, laughing. It turned out Inosuke was the "neighbor Old Wang".

"Aaaah~"

Zenitsu, receiving a massive shock, foamed at the mouth, his eyes rolled back, and he fainted.