I thought we had become a close family... Yuri married her husband who is older than her. Her husband had remarried and his stepchild, Tatsuya, was also living with her. Yuri thought that they were close in age and could talk about anything easily, like a brother and sister. On the contrary, Tatsuya falls in love with Yuri as a woman. Yuri and Tatsuya, who have a delicate relationship, end up spending a week alone...