C-2496 Eri, a married restaurant worker, is seduced by a director while her husband sleeps

Eri, a 30 year old woman married for four years, works at a Western restaurant with her husband. The restaurant's regular customer, director Kyosuke Murayama, invites the couple for drinks and, once the husband passes out, persuades Eri to have sex. She responds to his advances and ends up cheating on her husband.