His wife had returned to her parents' home, leaving Atsushi struggling with household chores and living in a messy house. Worried about Atsushi, his sister-in-law Sora comes to help with the housework. Although Atsushi feels a slight sense of guilt for inviting a woman other than his wife into their home, his sister-in-law's unexpected visit is a great relief to him... However, Sora's true intention is to satisfy her own desires by replacing her sister's husband. Unaware of this, Atsushi is in the bath when Sora...
