After a nuclear war destroyed the world and made it a cold gray wasteland, you can’t survive without the gas mask because of soot, ash and smoke in the air, and bleeding out nose, ears and mouth is normal because of the radiation attacking body from the inside, Theres not a lot of buildings left and not a lot of people either most living things has dies due to the cold, suffocation or radiation
But maybe you’re not all alone, and hopefully that person is safe to be around 