Saijo Kinuka is a housewife and has a 17-year-old daughter and 15-year-old son with her husband. Due to the death of her father-in-law, she moves to a Western-style house in Kamakura left behind by him together with her family. Kinuka finally realizes her longtime dream of opening a flower arrangement school by doing it in the salon of her new house. Just when she thinks that her life is already perfect, she is aghast to find her ex-boyfriend Seno Itsuki at her housewarming party even though they had parted ways 18 years ago. Although Kinuka manages to chase Seno away that day, strange things start happening in the Saijo household as food is found to be missing from the fridge and her husband's clothing disappear for no reason. It turns out that Seno has started living in the attic of the house and this gradually causes the revelation of secrets hidden by the people around Kinuka which leads to her being forced into a corner mentally. When a murder takes place, this then causes her fate to be affected drastically.