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Naruto x Demon Slayer: The Uchiha Who Crossed Worlds

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Synopsis
Traveling through Naruto, Uchiha Arashi, who has no golden finger, can only survive and develop, hoping to change the fate of genocide. However, things do not go as he wishes. In the end, he is powerless and cannot prevent the arrival of the night of genocide. In order to survive, Uchiha Arashi had to fight wits and courage with Obito and Itachi, but due to his low strength, he was ultimately unable to escape. Just before his death, he was under pressure to awaken the Uchiha clan's biggest cheat - the Mangekyō Sharingan. Finally, under the power of the Sharingan, Lan traveled to the world of Demon Slayer and survived. But how could Lan, who was unwilling to be ordinary and vowed to take revenge, let Uchiha Itachi and Obito go? When Lan learns the breathing technique, what kind of sparks will be created by the collision of breathing technique and ninjutsu? (New author, please enjoy the large portion as much as you can!)
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Chapter 1 - Chapter 1: The Night of Genocide

Land of Fire, Konoha Village —

In the dead of night, within the Uchiha Clan's compound, a figure stood atop a tall utility pole, gazing indifferently at everything belonging to his clan.

"It's time to act. It's time to end this cursed clan…" These words seemed to be spoken to himself, or perhaps to the empty air.

After speaking, the shadowy figure instantly vanished.

Not long after the shadow left, a ripple appeared in the air, and a person wearing a single-eyed mask emerged from the void.

"Let's begin, White Zetsu, you're in charge of clearing out the small fry…"

One by one, white figures slowly surfaced from the ground, grinning with mouths full of sharp teeth and saying, "Wagahda…"

Uchiha Nagi leaped swiftly across the rooftops, arriving at the clan leader's house in no time.

Uchiha Fugaku was sitting in the courtyard, drinking alone under the moon, a solitary figure.

Uchiha Nagi landed lightly, standing before Fugaku.

Fugaku didn't turn around, silently gazing at the moon. "Uchiha Nagi, what are you doing here…?"

"Clan Leader, you should know why I'm here. The son you're so proud of has already begun. He is currently slaughtering our clan members."

Fugaku remained silent, simply pouring wine, cup after cup… "I told you half a month ago. It seems you intend to abandon your clan members," Uchiha Nagi said sarcastically.

As a Transmigrator, he had known this outcome ever since the Nine-Tailed's attack several years ago. The huge Sharingan in the Nine-Tailed's eyes meant this blame could never be shaken off.

Afterward, the Uchiha Clan was first forced to relocate their compound, and then step by step, they were pressured, driving the clan members to the brink of rebellion. Shisui's death finally became the last straw that broke the camel's back.

Uchiha Nagi was an orphan; his parents died in the Shinobi World War. Growing up as an orphan, to avoid being cannon fodder on the battlefield, Uchiha Nagi desperately studied Medical Ninjutsu and became a highly skilled Medical Ninja.

Ultimately, he successfully avoided the fate of cannon fodder and survived.

However, reality was harsh. The only prodigies were Shisui and Itachi; even Obito was a mediocre talent before Rin's sacrifice. Uchiha Nagi was also just an ordinary member of the Uchiha.

After many years of diligent training, his strength had reached its limit, and his mental power was at its peak, but he still couldn't break through the final barrier and awaken the Mangekyo Sharingan.

Uchiha Nagi knew the reason himself: without someone with deep bonds dying in front of him, his spirit wouldn't be stimulated, making it impossible to break through the final barrier.

And because of the Third Hokage and Danzo, the entire Konoha avoided the Uchiha. He also disdained to fawn over others to gain companions for deeper bonds.

Reality was incredibly cruel. Not being a child of destiny, without a cheat-like golden finger, Uchiha Nagi could only rely on his own perseverance, day-in and day-out training and study, to become a Jonin.

How many Kakashi could there be in the entire Konoha?

As for Might Guy… the current Might Guy was still a Genin… Uchiha Nagi, a person whose two lives combined exceeded fifty years, naturally wouldn't flatter others. Over time, he was just ordinary friends with many protagonists.

Ultimately, he too was influenced and possessed the arrogance inherent to the Uchiha Clan.

"Sigh…"

"Since that's the case, may I make a request, Clan Leader?" Uchiha Nagi had long anticipated this. Knowing Itachi planned to betray the clan, Fugaku had held onto a last shred of hope that it wasn't true… There is no greater sorrow than a dead heart. Itachi had begun the slaughter, and his heart had completely died. A dead man would care about nothing, including his own clan members. "Please speak." Fugaku put down his wine cup.

"I want to take the Uchiha Clan's Ninjutsu scrolls."

"Do you have a way to escape?"

"Yes…"

"Then go to my study and take them. The second bookshelf is where they are. There are also the Uchiha Clan's 'exclusive Ninjutsu' there. Take them all, as long as you can escape."

"Thank you, Clan Leader."

Fugaku nodded, pouring himself another cup of wine and drinking it. He had always admired this very hardworking junior… Time waited for no one. Uchiha Nagi quickly went to Fugaku's study, identified the second bookshelf, which was entirely filled with Ninjutsu books, and put down a storage scroll to pack all the books away.

"Hmm? What's this?"

Uchiha Nagi saw a sword placed in a box… After tidying up, he quickly closed his eyes to sense. To avoid running into Obito and Itachi, Uchiha Nagi had arranged several Shadow Clones to stake out in advance.

There was a clone at each different position, and each clone used a Transformation Jutsu for disguise. This way, if Obito and Itachi killed any clone, Uchiha Nagi would know their location from the transmitted memories.

"They're here. One is in the east, one in the west. Both are slaughtering the Uchiha Clan's Jonin along the east and west directions, and there are also some White Zetsu slaughtering the elderly, weak, women, and children nearby." Uchiha Nagi closed his eyes, organizing the information transmitted by his clones.

"In that case, I'll escape from the south."

At this moment, on the outskirts of the Uchiha Clan's compound, a large group of masked individuals surrounded a sitting on the ground seals, and a transparent barrier appeared in the sky. It was Root.

Occasionally, some Uchiha Clan Jonin sent out distress signals, all blocked by the barrier. Even if someone tried to escape, they would find it impossible to break through the barrier.

Even if they broke through, they would immediately face the Root Ninja's annihilation. And if they didn't kill the barrier Ninjas, they could immediately restore the barrier.

"Watch carefully, don't let anyone escape, or I will hold you accountable." Danzo stared expressionlessly at the Uchiha compound.

"Yes, sir."

At this moment, a shadow hiding in the trees laughed sarcastically. It was Uchiha Nagi's clone. Stepping out of a large tree carved with secret incantations and barriers, Uchiha Nagi directly opened a storage scroll… Swoosh —

Bang!

Boom!

Multicolored distress signals rose into the sky, various emergency rescue fireworks. The last time they appeared was during the Nine-Tailed's attack.

Suddenly, everyone in Konoha was in an uproar, as emergency distress signals appeared in the Uchiha compound.

"What's going on? Someone's calling for help."