GVH-377 Mother and son rape Rui Ogasawara

Rui, a mother who has raised her only son, Kota, despite financial difficulties. - To prepare for the entrance exam fees, she starts a water business as a side job, but one day a customer asks for a physical relationship in exchange for a large sum of money, and she reluctantly agrees. - Then, Kouta accidentally witnesses his mother's suspicious behavior. - Kouta despises Rui, and because of this, he becomes unable to suppress the distorted feelings he had for Rui.