The story primarily follows three people: a nurse named Diana, a firefighter named Carlos, and a boy with a spherical helmet named Q. The three protagonists are trapped in a facility along with six other participants. The nine are forced to participate in the Decision Game, a deadly game which involves bracelets that inject them with a drug every 90 minutes which induces memory loss, killing 6 out of the 9 players, exploring the facility and solving escape-the-room puzzles in order to survive and escape, and figuring out the truth behind the game and Zero's identity.