Aya Mitsuru, a magazine writer who is worried about her work being ridiculed by her cohabiting boyfriend, Hajime Otsuka. After having sexual intercourse with Aya, Hajime Kuzu goes out to the city at night. One day, Aya finds out that Hajime goes to a sex shop and goes to see his favorite sex shop, Karen Shinohara, pretending to be an interviewer. Aya hits off with Karen and makes a plan to discipline Hajime.