Married to Tetsugaku for five years, Ryo had been living a modest yet happy life. One day, while Tetsugaku was away on business, his boss Saishi suddenly visited. Saishi informed Ryo that her husband had caused significant damage to the company, leaving her confused and distressed. Pressuring her into signing a new contract to save her husband, Saishi demands her body as collateral. Willing to sacrifice herself for Tetsugaku, Ryo submits—but from that day on, her anal sensitivity is systematically awakened, introducing her to uncharted pleasure and humiliation. As her rationality erodes, she repeatedly climaxes with her ass spread wide, gradually succumbing to the overwhelming ecstasy, becoming a sex slave consumed by anal gratification.