Based on the game by Cattleya.

After Kusakabe Akihiko's wife cheats on him, she eventually runs away. Upon learning of this, Sayuri, Akihiko's mother-in-law, comes to him to apologise, convinced that this is all happening because the blood of prostitutes runs in their veins. When she was young, Sayuri had been tricked by a man and became pregnant. In order to support herself and her daughter, she worked as a call-girl.

While attempting to comfort the distraught Sayuri, Akihiko becomes extremely conscious of her bewitching attributes, and his long unreleased sexual desires start to flare. This does not go unnoticed by Sayuri...