Tsuyoshi ends up living with his father's new remarriage partner, Yuna. However, Tsuyoshi begins to notice something unusual about Yuna. Yuina is always without a bra at her house. Tsuyoshi, who has reached his age, naturally makes his crotch bing when he sees the nipples of Yuna, who is a different woman, even though he is his family. And in fact, Yuna, who is not satisfied with her husband's Ji Po, gently seduces Tsuyoshi.
