Due to her husband's job loss and mounting children's tuition fees, Nana Ogawa decides to work at a soapland. During the interview, her entire body is meticulously examined, forcing her to endure intense humiliation. She feels relieved when told there will be no actual intercourse, but during a practical training session with the interviewer, an unexpected incident occurs. Trapped in a secluded room with no escape, she struggles both physically and mentally through this first-time experience, gradually beginning to shift emotionally as she endures the overwhelming sensations.