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Although she is on good terms with her husband, Umi spends her depressing days without being blessed with children. One day, my brother-in-law, Kyoichi, visits my house for a memorial service. Kyoichi, who has a strong sexual desire and loves women, relentlessly pokes at her lust hidden deep inside. "I was just swept away..." Umi tells herself, and ends up having a one-time relationship. However, the relentless caressing that is different from her husband, and the stimulation of the meat stick that penetrates to the top of her head, quickly overwrites the pleasure. And Umi suddenly fell into a secret affair with her brother-in-law...