A void.
An endless void.
What happened? Is this a dream?
You pinch your arm. Ow. Weird. Must be a really vivid dream, then. You refuse to believe it's real.
And that's okay.
Let's keep going.
It starts with exploring the white void with a dark sky (see concept art). Player and Sal end up in the same dream, but they don't think much of it. After all, P did only recently start sleeping in her house. This kind of stuff seems a bit more normal for Sal, but she'd usually analyze more than this. Maybe she knew the secret all along? Probably won't find the answer to that question anytime soon.
Eventually P and S will find a campfire spot to rest by. This helps P get to know S, and get a small hidden hint about the reality of this world.