Layne woke up already bitten. A dark voice in his head introduces itself and begins teaching him magic and techniques for growing stronger. The voice has a destination in mind: the castle in the mountains, where the vampire who made Layne is waiting. Getting there requires surviving a randomized set of obstacles — the Black Mage who might be able to reverse the transformation, the ghost of the old castle that eventually collapses into its own decayed form, a vampire hunter who challenges Layne to a duel, and an assassin who makes Layne dodge bombs. The player decides how Layne uses his power — drinking enemy blood, transforming into a bat, building a servant network, or surrendering to madness — and which of the multiple unique endings those choices lead to. More than thirty enemy types stand between Layne and the top of the castle.