Adult PC Game: Second Coming of the Goddess ~Labyrinth of Pregnancy and Pleasure~ Ver.1.0 by meme meme Archive

You enter the mansion to save your sister who has been by a whore.
There you will find a group of girls who have been deprived of their memory and ability to reproduce...
You must cooperate with them and defeat the "goddess" who rules the mansion.
The girls say that they can save your sister and regain their ability to reproduce.