In the year 2022, the ingenious programmer, Akihiko Kayaba, develops the world’s earliest fully immersive virtual reality equipment known as the “NERvGear.” This groundbreaking machine opens up endless possibilities for the Virtual Reality (VR) world. Four years later, the successor to the NERvGear, the VR machine, in its fight against the second-generation civilian FullDive device “AmuSphere,” releases a next-generation wearable device called the “Augma.” The Augma replaces the FullDive functionality, emphasizing the maximum expansion of Augmented Reality (AR) features.

As the Augma could be safely and conveniently used in an awakened state, it swiftly gains popularity among players. This killer-level content named “Ordinal Scale (OS)” became an Augma-exclusive ARMMO RPG. Asuna and her companions engage in this game, and Kirito also prepares to join the battle.