It’s the end of the world, and Character A is one of the select few people who have been lucky enough to be sheltered in an enormous, underground military bunker. Terrified and separated from their family, Character A uses their journal to chronicle the events that transpire inside of the bunker as the bombs fall outside.
Outside of the bunker, Character B was a prodigy – a real wiz kid, a budding actor, an Olympic medalist, etc. – but inside of the bunker, they’re just like everybody else. After befriending Character A, the two of them swear to stick together as the bunker turns into a living hell of food shortages, failing electricity, and a radical group that insists on trying to open the bunker doors.