Fear! Manor of Blood

(from ebookjapan):
On a road trip home ten years ago, Remy's father and mother were brutally murdered and disappeared in a mansion that had been uninhabited for hundreds of years, leaving Remy in the car. Remy was taken in by an old man who lived alone in the village, and he would stop Remy from approaching the mansion in search of clues about her mother and father with a frightening look. However, when the old man passed away, Remy was left all alone in the world...