Mai is a sweet, attractive girl whose life is a living hell. Working as a slave for a cruel mistress, she spends her days toiling as a maid and her nights being raped and tortured by her mistress' wealthy clients. What makes this even worse is that Mai can regenerate any physical damage her body receives, even fatal injuries. Thus, she is routinely burned, bludgeoned, cut up, and otherwise ripped apart purely for the entertainment of various sadistic loons, in addition to the sexual tortures they put her through.