After his wife returned to her parents' home, Atsushi was left behind and struggled with household chores, living in a messy house. Concerned for Atsushi, his wife's sister, Sora, came over to help with the chores. Despite feeling a slight sense of guilt about inviting a woman other than his wife into the house, Atsushi found her unexpected visit as a great relief… However, Sora's true intention was to satisfy her own sexual frustrations by taking the place of her sister's husband. Unaware of this, when Atsushi was in the bath, Sora…
