Adult PC Game: Abyss of Pleasure Ver.0.2.6 Remastered by Jpegsama Archive

Evil reigns in the world, most of the human kingdoms are enslaved by the forces of darkness,
and those that remain are defending with their last strength.
People make up legends about ancient artifacts called "Onems". It is said that if you collect them all,
then you can gain complete control over the forces of darkness.
There are rumors that this is just a fairy tale to calm people down.