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Japanese light novel series written by Keiichi Sigsawa and illustrated by Kouhaku Kuroboshi. The series is a spinoff of Reki Kawahara's Sword Art Online series. A manga adaptation by Tadadi Tamori launched in 2015, and an anime television series adaptation by studio 3Hz premiered on April 8, 2018. Both the light novels and the manga adaptation are published in North America by Yen Press, while the anime is licensed by Aniplex of America.