The Hosaka couple return to their parents' home after Yasuzo loses his job. Rion, the brother's wife, welcomes them warmly, but the eldest brother Shuichi severely scolds Yasuzo for returning home. "Since you've come to this house, Eri must follow the customs," he says, but Eri, who knows nothing of it, doesn't get it... A little while later... while Eri is hanging out the laundry, she sees Rion devouring the second son, Ryoji. Eri can't hide her shock, so Rion begins to tell her about the customs that have been passed down in the family...