A sex movie of two girls Yuna Kitano and Sakura Misaki, their husbands Takeshi and Daisuke, recently the relationship between the two families has declined and to strengthen their relationship, Daisuke suggests that the two should exchange wives to warm up the sexual relationship between the two families. Takeshi and Yuna fuck each other first, while Sakura and Daisuke sit and watch the two fuck each other in front of them, making them both horny and also rushing to fuck each other. Since then, they fuck each other in pleasure and the relationship between the two families has become even closer and more firmly reinforced….