Rumi, an adopted daughter of Yukie Kitazawa, works for the company owned by the Nogawa family. After a car accident involving her mother, she becomes the target of blackmail by the powerful Nogawa patriarch, who exploits her through a financial contract.

She is also caught in the feud between Taketo Nogawa and his father, as both men vie to dominate and degrade the Kitazawa women, forcing Rumi into the role of a love slave amid their conflicting interests.

The return of Rumi’s father later introduces new tension into the household when he develops an uncontrollable urge for her younger sister, Tomoko, threatening the family’s stability. Throughout this period, efforts are made to preserve the family’s unity.

At times, Rumi demonstrates concern for the solidarity and well-being of the Kitazawa family, revealing a complexity beyond mere victimhood. Her experiences form part of a broader narrative of power abuse and the struggle to maintain family unity under dire circumstances.