The AV director, Koichi Takahashi, who calls himself the 'lover of a married woman's heart,' invites his wife's female friend to stay at his house with ill intentions. Nothing good happens to the married woman spending the night alone with him... Kumiko, 35 years old, in her 11th year of marriage, no children, helps out at the family udon shop. The supposed absent homeowner returns, and the flustered married woman ends up having dinner with him, relaxing and confessing her lack of feminine charm. The insecure married woman is encouraged by the director and decides to receive lectures on how to improve her relationship with her husband. She accepts the increasingly intense guidance, agreeing to the phrase 'just a little,' allowing him to manipulate her genitals and even insert his penis. She reaches climax with each change in position, immediately orgasming from behind. Tortured with toys in the middle of the night, she is made to cum repeatedly, retaliating with morning fellatio. Even during morning sex, she writhes her hips obscenely and moans in ecstasy.
