Yokohama has become a lawless district ruled by biker gangs. The Crazy Babies, led by the 17‑year‑old Hiromi Katayama, are famous across the entire Kanagawa alliance for their powerful fighting skills and unwavering moral code. When rookie Toshi Ikeda seeks to join, he swears to Katayama that he will uphold the gang’s ideals and vows to abstain from combat during his first probationary month, or he will forfeit his chance to become a member. Ikeda’s fiery nature soon thrusts him into a confrontation that unintentionally sparks a feud between the Kanagawa gangs and the dangerous group from Nagoya.