Tomoe's husband works overseas as a trading company executive and has been away from Japan for a long time. Meanwhile, her younger brother-in-law, Naoya, fails to secure a full-time job and continues living with Tomoe, spending his days frequenting brothels and piling up debt. He devises a cruel scheme to force Tomoe into working at an anal soapland. Falling into his trap, Tomoe is manipulated by the brothel owner Mizushima through cunning persuasion, ultimately being positioned as an anal soapland girl luring in customers. The story centers on how Tomoe navigates this dire situation, with her psychological and physical struggles forming the core of the narrative.