Takahiro, who is about to become a university student, has lost his father and is living with his stepmother Mai, who he is unable to get along with. Mai, who wants her son to call her mother, makes an effort to close the gap between them, but Takahiro has a girlfriend, Eriko, who is much older than him. By coincidence, Eriko is Takahiro's mother... Mai, jealous of Eriko, is so filled with love that she kidnaps Eriko and then gives in to Takahiro...