Due to her unemployed husband, Riona, a married woman, ends up saddled with massive debt from a yakuza-affiliated relative and is forced to work at a brothel under his control. Determined to keep her dignity, she vows to protect her "pussy at all costs." Enraged by her defiance, the uncle ties her up and brutally rapes her with an extremely thick cock. This traumatic experience awakens her deep-seated masochistic desires, leading her to willingly engage in full intercourse and quickly rise as a popular sex worker. However, subjected to the cruel and relentless assaults of the brothel manager, Riona transforms into a gleefully submissive, perverted female masochist who thrives on humiliation and pain.