Although she gets along very well with her husband, Umi goes through boring days without the blessing of having children. One day, my brother-in-law, Kyoichi, visited my house for a memorial service. Kyoichi, who has a strong sexual desire and loves women, constantly teases her hidden desires. “I just got carried away …” Umi said to herself, and ended the one-time relationship. However, the constant caressing was different from her husband's, and the stimulation of the meat stick penetrating the top of her head instantly overrode the pleasure. And Umi suddenly falls into a secret love affair with her brother-in-law …