Naruto's Brother Is the Demon King

Nagano Kenichi became a Demon King to bring his younger brother back to life. Only after being killed by the "Hero" did he discover that he and his brother were both virtual data.

After destroying the world, Nagano Kenichi found himself in a strange world with no magic, only chakra.

With his life's purpose shattered, Nagano Kenichi idly opened an inn and gave up on everything.

No one ever came to the inn, and Nagano Kenichi didn't mind. Until one day, he was surprised to find a blond, whiskered little boy secretly wiping away tears beneath the eaves. The child was pitiful, and adorable.

For some reason, Nagano Kenichi reached out to him, and the boy became his little brother.

After raising the child for a while, he got ready to take him on a trip.

Then a crowd of people surrounded them.

Looking at the people demanding that he hand over his little brother, Nagano Kenichi snapped: "You mongrels!"

In an instant, the heavens and earth changed color. Night and day coexisted, and a gigantic magic circle appeared behind him...

Konoha, which had only wanted to stop them from adopting Uzumaki Naruto: !

Then his little brother somehow picked up a spiky-haired boy and an amnesiac orange-haired, blue-eyed boy.

Faced with his little brother's hopeful gaze, Nagano Kenichi reluctantly gave in. "Fine, I'll raise them!"

Theme: Protecting the weak