Sword Art Online: Fatal Bullet establishes itself as a standalone entry within the Sword Art Online franchise, immersing players in the world of Gun Gale Online as the protagonist of an original story. Players create their own avatar to explore devastated lands, engaging in third-person shooting against encountered enemies. Within this action-RPG framework, players also encounter new and familiar faces from the Sword Art Online series.

The journey through this gun-focused world introduces the rare AI companion, ArFA-Sys, after a chance encounter. Players make choices throughout their adventure, with each decision carrying consequences that shape the unfolding narrative. This action RPG delivers a personalized story driven by player decisions within a third-person shooter combat system.