The game takes place in a school for demons called Maritsu Evil Academy. It's a school for demon students so you have to pull pranks, skip class, and not do homework. The students who fail are the ones who go to school on time and do their homework. Confused? Don't worry, you're not alone. The story is about a particular Demon student named Mao who is top of his class, basically the king of mischief. But when a student named Beryl who's also the top delinquent hears of Mao's success, it becomes a journey for both of them to get on the path of being the ultimate "Demon Delinquent" and earn the title of "hero."