Sado Taro became a masochist—someone who derives pleasure from enduring physical or psychological pain—during middle school after his classmate, Yuno Arashiko, punched him. Now in high school with his friend Tatsukichi, he aims to shed this sexual tendency and live a normal teenage life. He learns about the Number Two Volunteer Club, led by Isurugi Mio, which advises and assists students with various needs and troubles. The catch is that Isurugi Mio is an extremely violent and bossy girl, the kind who treats Taro terribly while simultaneously arousing him. Taro reluctantly asks for her help to resolve his issue, unaware that his life is about to become significantly more complex.