Renowned throughout town for his fighting skills and his infamous "Devil's Right Hand," Seiji Sawamura is hailed as the most indomitable seventeen-year-old around. Despite the tough exterior he portrays, Seiji yearns for companionship and despairs over being single for the entirety of his teenage years. His tough-guy persona, however, only serves to diminish his desirability among women. His world is turned upside down when he wakes up one morning to discover that Midori, a girl who has had a crush on him since middle school, has replaced his right hand.