Delta is zero, so the rooms were Delta's ideas. So he put his sister inside an incinerator. What a good brother.
Aoi awaited all those years to save his sister from the incinerator. A true brother's love. All this to later, on the last game, another guy do exactly the opposite and placing his sister inside one incinerator and making his mother decide between her and her lover.
How weirdly twisted can this be?










