Nao lives happily with her husband who runs a company near their home. One afternoon, a delivery man called Sugiura takes a liking to Nao and rapes her. Nao is threatened and has no choice but to do as Sugiura tells her from that day on. The couple's daily routine is to have lunch together with her husband when he returns home. Even though he knows that her husband has returned home, Sugiura forces Nao to have sex with him wherever they are...