Yukiko is a young wife who feels lonely and unfulfilled with her marriage. Her husband, Koichi, does not meet her needs, and they sleep separately. To make matters worse, she discovers some photos on his phone of an unknown naked woman. Additionally, one night she sees her two children, who are not related by blood, sleeping together in bed. Yukiko tries to satisfy her needs independently at home until the visit of Koichi's father, which leads to a change in her family dynamics.