Due to taking social dance lessons at home, Kanae decided to start dancing. She invited her husband to join, but he ignored her, leaving her feeling lonely lately. One day, while alone with her instructor, Hirai, he takes advantage of the situation and pins her down. After a long time since her last intimate experience since marriage, she feels her inner depths penetrated and her body reacts involuntarily, overwhelmed by pleasure. When the next lesson day arrives, a new development awaits her.