As soon as Lenna steps outside of her school at the start of the game, she's lying on the floor unconscious. This may seem odd at first, but she's in the exact same pose in Corrupted Memory #7 after she's transformed into a human. Furthermore, in the Archangel School, she says she thought the schoolhouse was a corrupted memory. Putting all of these together, it seems that the game begins immediately after Delvin corrupts the world, and the Archangel School would've been in the position of the glitched schoolhouse.
