The game follows the same basic storyline as the Sword Art Online novel volumes 9 through 18 and the Sword Art Online: Alicization anime.
Following the events of the Sword Art Online Alicization anime series, Sword Art Online Alicization Lycoris finds Kirito in a mysterious but familiar virtual world, “Underworld,” where A.I.s behave like humans.
The Sword Art Online: Alicization anime premiered in Japan in October 2018 and is streaming on Crunchyroll, Hulu, and FunimationNow.
However, the game does not follow the same route as the Sword Art Online: Alicization – War of Underworld anime run that premiered last October.
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SWORD ART ONLINE Alicization Lycoris - Customization & Exploration Trailer