Seizo Munakata, taken in by Shigemasa Mukai, the boss of the Toyo-kai, runs a ramen shop while secretly handling the syndicate’s underground dealings. Former biker gang leader Ryuichi Sawamura and ex-finance bureaucrat Kunihito Soma decide to follow Munakata’s lead. But trouble strikes when Mukai’s wife, Harue, and granddaughter, Shizuka, are abducted by unknown assailants.