Yuu, a mother, teaches her two daughters, Hina and Mari, how to make money... but she does it by using her body as prostitutes! When she lets a delivery man into her house, she seduces him in her underwear. She manipulates the excited man, and after negotiating the money, she has sex with him from behind at the front door! The eldest daughter follows her mother's example and seduces a married man, and after enjoying some wet sex, she threatens him with her affair to get some pocket money. The second daughter seduces a rich company president, makes him ejaculate with a crab-legged cowgirl position, and then charges him a high price! The three prostitutes in the family work together to milk the sperm and money!