The fûfu kôkan: Hoshigaru tsumatachi

Original title: ザ・夫婦交換 欲しがる妻たち

Takashi is a man of extraordinary sexual prowess who cannot be satisfied without having sex with his wife Akiko before going to work. He also has a relationship with his sister-in-law, college student Yoshiko, who comes to visit while his wife is away. His next target is Etsuko, a young wife who lives next door and whose husband works at the same company as Takashi.