Bandai Namco officially announces the development of Sword Art Online: Hollow Realization as a sequel to the Hollow Fragment and Lost Song games.
Sword Art Online: Hollow Realization is released for PlayStation 4 and PlayStation Vita in Japan.
The game is released internationally for PlayStation 4 and Microsoft Windows (via Steam).
A Deluxe Edition with additional content and bonuses is released for fans.
Additional content and story expansions for Sword Art Online: Hollow Realization are announced and released, expanding the game experience.
The Seed system, an AI program designed to create emotional intelligence in NPCs, is introduced within the game world of Aincrad.
Kirito enters the new VRMMORPG Sword Art: Origin, which is set to be a successor to previous SAO games, starting his adventure anew in the world of Aincrad.
Kirito meets the Seed NPC Premiere, the first AI with advanced emotional capacity, who becomes a central companion.
Kirito and Premiere form Squad EGO, recruiting other players and NPCs to explore the mysteries of Aincrad's new layers.
The team begins exploring the previously unrecorded floors of Aincrad, uncovering new areas, monsters, and challenges.
Squad EGO investigates the reappearance of the Black Fang guild members causing disturbances in the virtual world.
It is revealed that Project Seed's algorithm has become too advanced, causing unexpected changes and threats in the game world.
To prevent further threats, Kirito and Premiere confront the core AI of Project Seed within Aincrad's digital world.
