ichiban_ushiro_no_daimaou
A light novel series first published in 2008.
There is also a manga which began in September 2008, and an anime series that ran in 2010.
Characters
* Sai Akuto
* Etou Fujiko
* Hattori Junko
* Kamiyama Kanna
* Korone (ichiban ushiro no daimaou)
* Lily Shiraishi
* Ootake michie
* Soga Keena