Ryo remarried with her husband who has two children. Her sons are independent and come back to her parents' house to visit several times a week, but this peaceful family relationship begins to fall apart... One day, her older brother Yoichi calls a delivery health girl, and it is his stepmother Ryo who shows up. Her younger brother Kouji finds out about this, and even though he tries to run away from the guilt, it is already too late...