Ranboo has dreams. Well, the same dream: he's falling, and he wakes up in a field surrounded by nine others. Every night for the four years since his son's first birthday, he hasn't been able to shake the creeping feeling that the haunting dream means something. He's not sure just quite what- until he wakes up to an empty home, and he falls through an endless darkness, finding himself in that field. Alongside the nine others that have, the group has to learn how to live together, working against external forces to bring back the way their world once was.