college student Sigma Klim, abducted with eight others into a deadly game called the Nonary Game: Ambidex Edition, run by a rabbit AI, Zero III, forcing players to choose to "Ally" or "Betray" in puzzle-filled rooms to gain points (BP) and escape, but Sigma uncovers complex branching timelines and consciousness jumps to prevent a future catastrophe involving the deadly Radical-6 virus, linking back to the events of 999.
