At the end of summer, when the cicadas' cries were starting to die down, married woman Keiko (Yuko Shiraki) and her friend Junko went to psychological counselor Sugiura's house to hear about brain orgasms. Feeling unsatisfied with the bland sex she has with her husband, Keiko decides to experience a brain orgasm... Sugiura's caresses stimulate her senses without touching her body, and Keiko's crotch becomes wet as she climaxes. Keiko blushes and leaves the scene, but she cannot forget the pleasure she felt, so she returns to Sugiura's place the next day...