On his way back to Yokohama, a young boy named Kenji Hase encounters a girl named Yoshiko who is being harassed by the Kaminaryu gang. He rescues her and they head towards Yokohama in Yoshiko's car. In Yokohama, there is an uproar because Kenji's father, Shozo Hase, a customs officer, has been accused of stealing confiscated drugs. The story unfolds with thrilling action as Kenji bravely confronts the gang of villains who framed his father and kidnapped him, all while seeking justice and vindicating his father's innocence.