His wife, Asako, was pregnant, leaving her husband, Toru, to go home. As she was left behind, she couldn't do her household chores, and her house was getting messy. At that time, worried about her Toru, her sister-in-law, Nao, came to help her with the housework. In fact, Nao came over to relieve her frustration. Unaware of such a thing, Toru invites his girlfriend Nao into her house.
