The latest work by Satoru Akahori!! Michio, a serious but unremarkable salaryman, died from overwork and underwent the textbook isekai reincarnation to become the Demon King, Michio. Due to his original personality, he sets a goal to "be defeated by a hero in a grand, Demon King-like fashion." Heroes challenge him to battle, but...? A struggle of a former salaryman Demon King who is overpowered, has a harem, and does plenty of lewd things, yet for some reason exudes a sense of melancholy!!