A Human Murder Weapon (1992)

A Human Murder Weapon 1992 / 人間兇器 愛と怒りのリング 1992 / Human Madness: Love and Anger Ring , Ningen kyôki: Ai to ikari no ringu

The Karate Kid is forced to fight in the underground fight-club for a privileged few wealthy sadists who enjoy watching catch-weight death-fights between men and women from different martial-arts schools. His principles forbade him to fight such matches, so the promoter forces him to watch his girlfriend being stripped and finished by a stronger woman, and then a young mother badly in need of money, entering a couple of matches. She survives two matches surprising the promoter, who arranges for a mixed tag match which end he has carefully arranged for. (Source: IMDb) ~~ Adapted from the manga of the same name by Kajiwara Ikki.