Hoirai Mai, a member of the Special Art Security Organization Art Guardian, bears the mission of protecting beauty. Her latest assignment is to guard Shino Yuki, a beautiful girl photographer. However, Mai remains skeptical about whether Yuki is truly in danger and continues her protection duties with doubt. Suddenly, the assassin Kuri attacks, poisoning Yuki. In an attempt to save her, Mai sucks out the venom and suffers severe physical damage from its effects. She manages to bring Yuki to safety and confronts Kuri, only to discover that beneath Kuri's charming and elegant appearance lies a vicious serial killer. Ultimately captured, Mai becomes the target of brutal torture. Just before the torment begins, Yuki appears and subjects Mai to a cruel lesbian fall-and-break torture session. The story ends in a tragic BAD END.