Most of it in the title. I remember that she didn't start out futa until she got gangraped by the ghosts, and there was some edgy exorcist chick who gave you the items you needed for the evil route.
I know the game you're talking about it was a Japanese girl who went into a haunted mansion, there were 4 or 5 ghosts you could save or kill. I can't think of the name but it was an old flash game I believe