Koichi Takahashi, an AV director who calls himself the ``lover of a married woman's heart,'' lets his wife's female friend stay at his house with ulterior motives. - There's no reason why a married woman who spends the night alone with her has nothing to do with her... - Sonoko is 30 years old, married for 5 years, has no children, and is a full-time housewife. - A married woman rents the room of her husband, an online gamer, and is shocked when the landlord, who is supposed to be absent, comes home. - They open up over dinner and decide to ask the AV director to put into practice how to resolve their marital problems. - Instructions with explanations... Kisses, caresses, and sullen faces. - A married woman whose lower back is twitching is OK to insert just a little bit. - A married woman stares at her partner with erotic eyes and writhes in agony as she blushes as she realizes how good it feels to be penetrated from behind. - Before going to bed, she starts talking about her sexual habits, then is restrained and blindfolded and toyed, causing her to lift her buttocks and writhe in agony. - The next morning, she has sex after being teased, arching her back and writhing in agony.