Rui Sakura (桜瑠依), also widely indexed under her true celestial identity as the Archangel Raziel (大天使ラジエル), is a prominent fictional character from the popular Japanese light novel, manga, and media franchise Magical Explorer (マジカル★エクスプローラー エロゲの友人キャラに転生したけど、ゲーム知識使って自由に生きる), which originally launched its commercial publication run in 2019.
Within the lore of the franchise, she is introduced as the long-serving, gentle, and deeply caring librarian at Tsukiyomi Academy (月読学園). Known for her soft-spoken nature and a peculiar fondness for fortune-telling, she serves as a comforting, maternal presence for the students and the reincarnated protagonist. However, behind this unassuming administrative facade lies a massive narrative twist: she is actually a legendary celestial entity wielding catastrophic, world-altering magical power. Her dramatic character arc—shifting from a peaceful school librarian to a tragic, high-stakes boss who must be subverted and rescued by the unified efforts of the main cast—has made her an exceptionally popular and memorable figure within the light novel community, driving a steady stream of database queries and lore searches among contemporary ACG (Anime, Comic, and Games) enthusiasts.
