The day before she was scheduled to return to her parents' house with her husband and son, Nagisa received a call from her sex friend Oshima, saying that he had the next day off and wanted to meet up. Nagisa initially refused, but then she was worried that if she missed tomorrow, she wouldn't know when she'd be able to see him again, and her body was bursting with frustration, so she desperately lied to her husband and son and stayed home alone to welcome her sex friend. The two of them were alone under the same roof all day, and they simply made love without worrying about what other people thought.