Ayumi Shinoda stars as a mature housekeeper with a stunning figure who begins working for Mr. Yanai, the senior managing director at her husband's company. After being blamed for the destruction of important documents, Ayumi is coerced into a sexual arrangement to protect her husband's career. Her nightmare intensifies when she is also forced to serve Yanai's perverted son, who subjects her to aggressive anal training. Trapped by the arrogant father and son, Ayumi is treated as a "public toilet," with her body and pride completely broken as they fill her with their seed.