Youichi is an ordinary uni student, and he wants to live an ordinary life. On the other hand, Youichi’s father is a mayor, and he secretly runs away after a series of scandals. Youichi is at a loss what to do… and he receives a package. There is a huge coffin inside…. He opens it and finds a girl sleeping. She wakes up and says, “I am a descendant of a vampire family.” A city office worker comes to his place and tells him that his father is a descendant of a traditional devil family, and he is decided to take over the devil after his father. At first, he refuses it and is given a couple of months to think it over. He finally accepts the offer to be the devil….