Anima Mundi: Dark Alchemist

[Yaoi Huntress Earth]

It was a PC game (http://en.wikipedia.org/wiki/Animamundi:_Dark_Alchemist) which has a lot of Ravenloftian elements: a doctor selling his soul to a demon to make a new body for his dieing sister, tragic romance, courtly intrigue, the chance for the player to either damn or redeem the said doctor, and a lovely gothic design. Not to mention that Bruno, the main bad guy, would make for a good darklord. Though I should warn you that it has homoerotic themes (they're not graphic, but they're obvious.) If you have an open mind, it's got that feel to it.