Aboard a spaceship drifting through the far future, the crew and passengers face a terrifying threat: the Gnosia, a parasitic force that possesses a human host and compels them to murder the others one by one. To survive, everyone aboard must debate, accuse, and vote to place the suspected Gnosia into cold sleep before it wipes them out, and the amnesiac protagonist may find themselves cast as an ordinary human, a hidden Gnosia, or one of several special roles. Trapped in a mysterious time loop that resets with each outcome, the player relives the deadly deliberations over and over, slowly piecing together the crew's secrets and the truth behind the loop itself.