The Demon Lord of the World

The Demon Lord reincarnates, losing his memories and living a new life. With the help of his past life's ten demon artifacts, he gradually grows stronger, accepts his identity, and leads the demon race down a path different from the stereotypical brutal and fierce image. On an Earth increasingly invaded by various forces, the unawakened Demon King is unknowingly recruited by Li Xuena into the national team. Using his abilities, he fights against the hypocritical immortals of the celestial realm, the soul-devouring ghosts of the ghost domain, and the man-eating monsters of the demon altar, saving the world. — Description from novelcodex.org