Kenji, the middle of three adult brothers, was always the easy child in his mother Tsubaki's eyes. One spring, his older brother moves out for work, his younger brother enters a residential school, and their father takes a job away from home, leaving Kenji and Tsubaki alone together. As the suddenly quiet house fills her with loss, Kenji grows bitter that she keeps thinking about his brothers and tries to claim all of her affection for himself.