"Numbers" is a teenage gang group at a gangsters’ haven, Rikuzan High School. The second position of the group, Akira dedicates to the top, Tsutomu; however, at the same time, he watches for an opportunity to be the top. One day, a big fight occurs and Numbers renews its members. Soon after Numbers is attacked by unknown gangsters and suffers serious damage.  Akira vows revenge against the gangsters.