Clione no Akari (クリオネの灯り, Kurione no Akari, lit. "Clione's Light") is a Japanese online novel by Natural-Rain. It was originally posted online in 2004, and was published in June 2012 by East Press. An anime television series adaptation by Drop began airing on July 12, 2017. The series is entirely directed and animated by Naoya Ishikawa.
Minori is an illness-stricken, constantly bullied orphan. After one rainy day, she doesn't turn up at school, having been admitted into a hospital in a distant town. Two months pass, and the girl's two school friends, Takashi and Kyōko, receive a mysterious email with no sender listed. The email reveals a summer festival taking place at a nearby town.