Sado Tarou suffers from sexual masochism; he experiences sexual pleasure from pain. He feels he won't ever have a normal relationship with his condition and decides to visit the Voluntary Club, a place that grants students' wishes, for a cure. At the club, he finds Isurugi Mio, a girl who thinks she is a god, and Yuuno Arashiko, the girl who caused his condition in the first place...