Love can be painful, but Sado seems to like it that way. However, since he knows that's odd for a high school student, Sado decides to join a certain club where he can beat out his masochistic tendencies. Unfortunately, that's like putting out a fire with gasoline, as the club members all have "issues" of their own, and guess who's about to become the new favorite whipping boy? Is even Sado ready for a nurse who forces other people into cosplay and a club president who believes herself to be a goddess? And if that's not complicated enough, toss in man-shy Yuno, the same girl who introduced Sado to his love of negative reinforcement, and Hayama, Sado's best friend and a compulsive cross-dresser who's also the girl that Sado is (unknowingly) infatuated with! Love is about to get really, really weird in MM!