A chaste married woman falls into the temptation of a lustful sportsman's big dick. Ibuki, a married woman who starts going to a personal swimming school to improve herself even though she is no longer having sex with her husband... Ibuki, who can't get the big dick of the instructor Tanaka she met there, has a physical relationship with Tanaka. A muddy adulterous sex with Tanaka that you can't enjoy with your husband