From the introduction:
As The World Ends... probably won’t end happy. It isn’t meant to. It’s a chance to explore things we normally don’t allow ourselves to. Things we hide. Things we cling to. Moments we live for. Sadness. Regret. Hope. This is about hoping against hope. By the end, you may have nothing physical left. But you might have some feelings that you finally dug into and examined. Hopefully, that gets you something or somewhere you may not have otherwise.
A GM isn’t necessary for this game but having one may make play easier to guide and help keep things on track. Alternately, if one person feels comfortable enough in the roll, they can play a character as well as guide the story.
The world is ending around you and you’re trying to make your way to some place you consider safe. You’re not sure if it is safe but you’ve heard rumors.