The invincible Yanki (Japanese delinquent), Monji Mori, leader of the Black Skull Gang, has been released from juvenile prison. Meanwhile, other infamous Yanki, Hayato, has a run-in with the local Yakuza. He barely escapes thanks to a guy who claims to be from the Gold Skull biker gang. Hayato gets caught in the middle as the two Skulls clash in a turf war of the ages.