Taroko Koshi, the prima dona of Hino Minami High, hides a dark past as a super-delinquent. Her life turns upside down when she meets a strange deer-human hybrid, Noko Shikanoko, who uses her deer powers to quickly discover Koshi-tan's secret past. To keep Noko-tan from revealing that delinquent past to everyone and ruining her perfect image, Koshi-tan befriends the deer girl and goes on various antics along with their school's Deer Club.