The city of Yokohama has become a lawless district for biker gangs. One particular gang, the "Crazy Babies", have a 17 year old leader called Hiromi Katayama that is famous throughout the entire Kanagawa alliance as being a strong fighter with a devout sense of morality. In the midst of defending Yokohama from rival gangs and keeping the peace, he also has his crush on his motorcycling classmate, Asami.