Living together with his wife and her mother, a woman named Eri, Satoshi enjoys a peaceful and harmonious daily life as a family of three. One weekend, his wife "Hitomi" leaves for a class reunion, leaving Satoshi alone at home with Eri. That night, slightly drunk and caught up in the moment, Satoshi confesses to Eri that he's been feeling uneasy because she looks exactly like his first love. Eri, who has long struggled with loneliness and grief since her husband's passing, gradually begins to respond to Satoshi's emotions, and their relationship starts heading in a new, intimate direction...