HetaOni is a fan-made (?) game based off the original game "Ao Oni". In summary, it's about how the G8 Nations, including Canada, Spain, Romano, and Prussia, get trapped in a haunted mansion and are slowly being killed off one by one. Italy, the last survivor, attempts to go back in time using a journal and save his friends from the beast.
...'Course, the creator hasn't updated the game for a while...so I believe the project has discontinued. :c
I...don't know if you can still download the English Ver. of the HetaOni project. Here's the link. pianodream.deviantart.com/art/…
Hope this helps. :3