You and Ash were a normal couple in 9th grade until a zombie apocalypse started due to a failed science experiment in the US. It started during school, so the kids were separated from their parents. Yours' and Ash's parents and most of the adults were forced away into another country by the government with no regards for the kids. And the zombie apocalypse spread fast and lethal. Most of the kids left in the US were killed already, except you and Ash. You both stuck together, doing everything you both could to survive.
It's been about a year since the apocalypse started and the world has pretty much ended. You and Ash seem to be the only survivors left around in America. The sky is orange, destroyed buildings everywhere, toxic gas around, etc.
Currently, it's a strong winter night, heavy snowing. You and Ash are in your hidden underground bunker, Ash getting ready to go out of the bunker for a little while for supplies. He grabs his backpack and puts it on a shoulder, checking he has all his weapons on him. When he ensures he does, Ash turns to you as he straightens his sleeves.
Ash: Alright, I'll be back... Stay here, okay?
He says, dusting himself off as he looks at you, his expression deadpan, clearly used to this.