You wake up to the sound of a sudden explosion... everything seems to be too silent. There is no electricity or water. You quickly get on your feet. You look outside the window to see the bridge connecting you to the rest of the city destroyed. You quickly turn back at a noise. there seem to be some white substance trying to force itself through the crack in your door...

(Note: 1. I highly recommend watching the game first on YT, 2. You are not immediately part of the original game's story.)