The story focuses on Hiroshi Tachikawa, a biker gang member who is converted into a "Black Dummy" by Gorgom. Black Dummies are cyborg replicas of the original in every way, except lacking the real Black's King Stone. After conversion, he escapes from his captors and tries fending off the monsters they send after him. He runs away and then ends up meeting his old biker gang on the road. He asks Sub, one of the members, for a jacket and bike. Once he gets to the old hideout, he finds that he has been replaced as leader by a thug named Okamura and then uses his cyborg super strength to beat him up.