After the tumultuous events of Sword Art Online and ALfheim Online, a new virtual reality game, Gun Gale Online (GGO), becomes the stage for eerie occurrences. Dubbed 'Death Gun,' a cloaked figure targets players in-game, leading to their real-life demise shortly afterward. Kirigaya Kazuto, approached by VR Crimes Division member Kikuoka Seijirou, delves into the unsettling connection between the virtual deaths and the real ones. To lure out Death Gun, who exclusively preys on elite gamers, Kazuto transforms his ALfheim Online persona into GGO and enters the prestigious Bullet of Bullets tournament.