Ayumi a housewife in her third year of marriage, feels unsatisfied in her sex life with her husband, Kenta. He comes home late from work everyday and when he tries to have sex with Ayumi, loses his erection midway through. One day, Ayumi is harassed by a street vendor, when a young woman, Eriko comes to her rescue. Eriko is injured when helping Ayumi and the latter, who used to be a nurse takes her home and treats her wounds. Suddenly, Eriko kisses Ayumi, who is confused and runs away. However, the next day, Ayumi visits Eriko again...