Sumire starts dating a childhood friend, but suddenly her father's company goes bankrupt. Furthermore, the house has just been renovated and there is still a large mortgage on it. Sumire 's father asks Sumire boyfriend's father, who has had lustful eyes on Sumire for some time, for money in exchange for his daughter's services. Furthermore, her father tries to start an illegal sex business, catering not only to her boyfriend's father but also to the middle-aged men in the neighborhood. Sumire is innocent and pure, but gradually she awakens to the pleasures of providing services using lotions and other products, and falls into debauchery.