The hentai is based on the yaoi manga of the same name by Shinozaki Hitoyo and Kousaka Tohru, which was released in 2002.

 

The protagonist of this story is a simple, unremarkable guy Ayase (Although he is notable for being an excellent partner for any yaoi heroes). He lost his parents early and got into huge debts because of his cousin. There is nothing to return the debt with, and the heroes decide to sell Ayase-kun himself into slavery to old and depraved perverts. However, he is saved by a strange gloomy businessman. With a light wave of his hand, he buys out Ayase for a very large sum of money. Now our hero is forced to live with this man and work off the money spent on his salvation...