One Piece: Shadow monarch? I'm Just Logistics! - Chapter 288: The Blocks Are Over

Louie became a mythical dragon that was capable of traveling between Earth and the Otherworld at will.

From this point on, the number of races in the Otherworld became more plentiful. His territory was orderly and clean, with incredible cuisine, countless novelties, and civilization and philosophy ahead of the whole world.

On Earth, his existence caused the rebirth of magic and mythology, allowing him to become the only God.

“I am the Golden King, the Giver of Life, the Champion of Magic, the Weaver of Dreams, the Guardian of the World, the Master of Time. Let mortals bow down before me and look up! Let the Gods tremble in fear before me!”

A boy from 21st century Earth, met an accident and later was reborn in Naruto’s Ninja World.
He is born in Uchiha Family and becomes the useless brother of Itachi Uchiha and Sasuke Uchiha…. Let’s see how he changed the Naruto world.

- Description from Novelupdates

Yohan wakes up ten years in the past, back when he still lived with his uncle and hadn’t yet lost his parents’ massage parlour. With a strange book filled with wellness techniques in his hands, he decides to live differently this time—more aware, more purposeful, and maybe even more fulfilled.