Dreamed hideo kojima made a 999/vlr style visual novel about "Choancy", a principle that allowed inanimate objects to be temporarily turned into clones of human beings (the clones don't know that they're actually inanimate objects)
At the climax of the plot the protagonist has an existential crisis when he finds out that he's been replaced hundreds of times over the duration of the game and may have only existed for as little as 5 minutes

