How can I have a heart of a demonic god in my body?! - Chapter 571 - 0566: Four Jade Soul Bead

Lucy Gray was a tech genius—until a stranger smiled, pulled the trigger, and ended his life.But death wasn’t the end. It was a recruitment.Dragged before a pantheon of ancient gods, Lucy learns his soul has been drafted into the Holy War—an eternal bloodbath in which Gods fight across shattered realms. Out of thousands, he was soul #4,000, chosen by Seraphine, the Goddess of Rebirth and Suffering.Now reborn in a dying world of Ogres, Giants, Beastkin, Dragonkin, and Elves, Lucy is a human among legends—a species exiled and nearly forgotten, for reasons that make him hated.Armed with nothing but defiance, sarcasm, and a bizarre ability to steal and master the powers of others, Lucy has one job: survive the impossible.The gods wanted a pawn.They got the wrong dead man.

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

220 years ago, in the legendary Dragon Demon War, Hero Azell ended the war by killing the evil Dragon Demon race’s King Atein. He was able to save the population, but as a consequence, he was cursed. While he was dying, the high magician suggested a gamble that might save his life.