Dai is the youngest of three siblings. From his mother, Maki's point of view, he was an easy-going child, but... One spring, his two older brothers got a job and lived alone, and his father was sent away from home. Maki feels a sense of loss when her lively house suddenly becomes quiet. Seeing her mother like that, Dai feels lonely and frustrated, and tries to regain her mother's love, which she couldn't monopolize until now.