While returning home from the local mall, Sakuno Uryū gets lost and calls her older brother, Shingo, to come find her just before her battery goes dead. It begins to rain and Sakuno gets help from a girl passing by who offers to call Shingo. Shortly afterwards, Shingo meets up with Sakuno and the girl who helped her, Airi Sena, in a nearby park. Shingo, Sakuno and Shingo's friend, Hayata Mukunashi, who attend Kagamidai Private Academy, are three of the students chosen to take part in a temporary ten-month transfer to Yuijo Private Academy, which until now has been a prestigious all-girls school...