You have been Marked...
A strange rumor is spreading through the shadows of Tokyo's H City: a mysterious disfigurement, like a grotesque birthmark, has been appearing on the bodies of certain individuals. Anyone who receives the Mark will rapidly die of unknown, horrifying causes.
Deprived of your memories, you arrive at a mansion rumored to protect the bearers of the Mark. As the doors swing open, the countdown to death has already begun...
Source: Official Site