Sword Art Online: Infinity Moment is based on Reki Kawahara's Sword Art Online novel series. The story revolves around a boy named Kazuto "Kirito" Kirigaya. He enters a virtual-reality, massively multi-player online world called "Sword Art Online" when 75 floors in Aincrad, a floating castle that is one of the main dungeons in the Sword Art Online universe, are affected by a mysterious system error. This bug wants to capture Aincrad’s remaining 25 floors. There is no escape from this world unless the player clears the game, but "game over" means the death of the player.