Umineko No Naku Koro Ni. A Visual Novel about a family in a mansion located on an island called Rokkenjima, where there's a legend about a Golden Witch called Beatrice that will start a killing if everybody fails to locate her hidden gold. The family reunion begins to discuss about the inheritance from Ushiromiya Kinzo, the head of the family, and grandfather of the protagonist, Battler.

After the strange killing begins, the protagonist refuses to accept that witches are real, and try to prove that a human could be the murder.

Man... This Visual Novel is insane, and I wonder this universe in a VR Game where you could walk around the mansion, talk to characters, investigate murders, duel with Beatrice in the logic game... That would be my perfect game and would sell me into VR.

Guessing use head tracking for aiming, curious about boss fights mini games.

Remember, the camera is always watching

Oh, nice.  Very nice.  It's something I should seriously look into.  But I originally thought you meant "Umemaro."  Nevermind.