Working Demon King Event Book

He is the king of god slayers. He is the tyrant who rules over all peoples. He is the devil who rules the world. "The Demon King went to work again today." "Bullshit, can the devil's work be called a part-time job?" ———————— "Hey, isn't it just an ordinary time travel article? What do you want to express by making the introduction so high-end?" "Can't you understand? Then go read a book!" All in all, it tells the story of a god-killer who defeats everything in various dungeon worlds.