Sado Tarou became a masochist, someone who derives pleasure from enduring physical or psychological pain, during middle school when his classmate, Yuno Arashiko, punched him. Now that he has advanced to high school with his friend, Tatsukichi, he wishes to eliminate this sexual tendency and live a normal teenage life. He learns of a high school club known as the Number Two Volunteer Club, led by Isurugi Mio. The club exists to advise and assist students with various needs and troubles. The only issue is that Mio is an extremely violent and bossy girl, the kind of person who treats Tarou terribly while simultaneously arousing him. Tarou reluctantly asks for her help to resolve his problem, unaware that his life is about to become truly complex.