Yokohama has transformed into a lawless area overrun by biker gangs, particularly the infamous "Crazy Babies" led by 17-year-old Hiromi Katayama. Katayama, known for his unwavering principles and formidable fighting skills, has garnered a reputation throughout the Kanagawa alliance. When Toshi Ikeda, a rookie seeking to join the gang, expresses his desire to uphold Crazy Babies' values, he promises Katayama to avoid conflict during his first month in the gang. However, despite his good intentions, Ikeda's impulsive nature leads him to stir up trouble, setting off a fierce dispute between Kanagawa's gangs and The Dragon Star Crew, a dangerous group from Nagoya set on conquering Kanto. Can Katayama protect Yokohama from The Dragon Star Crew's vicious ambitions?