Shimura Teppei grew up watching his policeman father who would ride side-by-side in marathons because he was a motorcycle cop, and dreamt of being a marathon runner as a child. But Teppei’s father lost his job and disappeared. Teppei ruined himself by becoming a well-known delinquent in the area. Under the influence of his childhood friend, Yuichi, Teppei chose to become a policeman after graduating from high school. He miraculously passed the recruitment exam and entered the police academy. However, he has been assigned to a “class of reserves”, which is a gathering of odds and ends. There are eight of them, and each day they are only instructed by the assistant teacher, Ryuzaki Misaki, to sweep the academy grounds.