Briefly about Why I Quit Being the Demon King manga:
During a period of chaos, the Demon King traveled through 665 realms before entering the human realm. A gallant hero ended the conflict.
Because of their divine sacrifice, humanity narrowly survived. But this led to the narrative of the next Demon King. Meet Demon King Demiourgos, the 666th. “I quit being the Demon King,” he stated before exiting the demon world. This is the story of a fugitive Demon King and a hero who becomes his subordinate. Why did the Demon King quit?
