Bizenghast

Dinah, a clincally insane protagonist living in an abandoned mill town with her sociopathic Aunt, teams up with the only other child in town to dispell the horros they find down in the long-lost Sunken Mausoleum. Challenged by a terrible spectre to free all the tormented souls of the lost graveyard, Dinah slowly recovers her sanity by working with her friend Vincent to untangle the riddles of the ghosts' many deaths.