Sword Art Online Alternative: Gun Gale Online (ソードアート・オンライン オルタナティブ ガンゲイル・オンライン) is a Japanese light novel series written by Keiichi Sigsawa and illustrated by Kouhaku Kuroboshi. The series is a spin-off of Reki Kawahara's Sword Art Online series. A manga adaptation by Tadadi Tamori launched in 2015, and an anime television series adaptation produced by studio 3Hz aired between April and June 2018. A second season produced by A-1 Pictures premiered in October 2024. Both the light novel and the manga adaptation are published in North America by Yen Press, while the anime is licensed by Aniplex of America.
Plot
Due to the incident that occurred in VR MMORPG Sword Art Online—where 10,000 players were trapped in the game on launch day—the popularity of VR games has plummeted due to fear of similar incidents. The NerveGear, SAO's VR device, was recalled and destroyed, but with the launch of its successor, the AmuSphere, combined with release of the license-free development support package the "Seed", the popularity of VR games saw a sudden resurgence.