Des:Rui, a mother who has raised her only son, Kota, despite financial difficulties. In order to pay for her entrance exam fees, she starts a water business as a side job, but one day a customer asks her for physical relations in exchange for a large sum of money, and she reluctantly agrees. Then, Kouta accidentally witnesses her mothers suspicious behavior. Kouta despises Rui, and as a result of this, she becomes unable to suppress the distorted feelings she has for Rui.