The Kanto Hell earthquake has completely devastated the metropolitan area. In the aftermath, the Slum King kidnaps girls and sells them as sex slaves. Mari wanders through the ruined landscape searching for her lover, Ken, only to be captured herself. While she endures torture and training as a sex slave, Ken manages to rescue her. Having become a member of the Slum King, Ken is offered a deal: in exchange for releasing Mari, he must kill Violence Jack.