Held at gunpoint after getting a little too drunk at the club, Clarissa is thrust into a new existence at the moment of her death. Dying just as her soul is fully brought into something called the "Centrality", along with the rest of Earth, her soul almost escapes into the afterlife, but is called back by the touch of the new System.

Due to an unexpected series of events, she is thrown into a dangerous sub-layer of reality known as a Dungeon. Here she must survive, though this may prove more difficult than she expects.

But of the world awaiting her outside the Dungeon? Well, she knows little of just what has happened to Earth and must discover it on her own.