Hironaga Ryota was a child when he was separated from his father due to his parents' divorce. He takes over the glasswork factory his father almost brought to bankrupty and manages to somehow get by. In the meantime, Ryota himself is also divorced with children he does not see. One day his older brother Shoichi says he saw their father out in the city. Thus begins the two brothers' effort to find their father.

L'histoire tourne autour de la famille de Ryota Hironaga, dont les parents ont divorcé presque aussi longtemps qu'il s'en souvienne. En conséquence, il a été élevé par une mère célibataire. Il en résulta une place vide à la table du dîner que son frère et sa sœur cherchent à occuper en cherchant leur père...