Based on the light novel, manga and anime, Sword Art Online: Hollow Fragment captures the characters and story line of the SAO universe - a series of. Sword Art Online is a Japanese light novel series written by Reki Kawahara and illustrated by abec. The series takes place in the. Watch Sword Art Online Alicization Episode 23, Administrator, on Crunchyroll. Cardinal appears on the top floor of Central Cathedral for a.