Based on the erotic game by Dwarfsoft.

A middle-aged man has lost his job and home because of his arrogant nature. Leading a vagrant lifestyle he became embittered and aggressive towards society. One day he meets a mysterious beauty Shima Itski, who invites him to become the founder of the sex cult “Ishin No Kai” and in addition to this, she offers him a huge amount of money, a house, and a car. Of course, our hero just could not refuse the sultry beauty and now he has become the “Lord” of a mad sex cult with unimaginably depraved rituals…

(Source: hentaihaven)