(1) The Strongest Demon Lord Lost a War So He Became McDonald’s Part-Timer in Japan

Maou Sadao was an Actual Powerful Demonlord but he lost his invasion against Humanity in another realm called Ente Isla. Forced to concede his territory, he escaped to Earth, Japan, where he has gained enlightment as a McDonald's Part Timer. However, it seems the Hero also followed him here too! Anime: The Devil is a Part-Timer!