Hanaoka, a private tutor, can't control the urge towards the student's mother-in-law, Aoi's plump body, and unintentionally sucks at her asleep. Aoi refuses to be surprised by her, but her body, which has her loneliness, accepts him and she is in agony. Her son, Ichiro, who witnessed her, accuses Aoi of nechinechi. Her friends are also invited, and a shameful and humiliating orgy for her is developed.
