My little sister, who is deeply passionate about professional wrestling, gradually started becoming more aggressive due to her intense interest. Worried about her increasingly violent behavior, her older brother decides to invite a pro-wrestling coach to help guide her. Through training with bamboo swords to stimulate her body, and soap play to strengthen the master-disciple bond, he supports her development. Eventually, she grows capable of handling multiple partners. However, when her brother unconsciously uses wrestling moves on her, she reverts once again to her aggressive ways.