Also known as: 空とあるゅう先生
Ukagaka ghost.
Ghost developer: Mishiro Haruka
First side: 蒼井 空 (Aoi Sora (Ukagaka)) - Single-winged Angel pupil enrolled in the "Wings' Garden" angel school
Second side: あるゅう先生 (Aruyuu-Sensei) - Sora's Teacher. Prefers demerit system.
Other side: 蒼井 羽根 (Aoi Tsubasa) - Sora's little sister, a librarian.
Favorite subject: Sora's daily bungles, Cladosiphon okamuranus
Download site: http://himaoka.sakura.ne.jp/nanika.htm