The Testament of Sister New Devil Light Novel

The Testament of Sister New Devil|新妹魔王の 契約者 スタメント |Shinmai Maō no Keiyakusha}} is a Japanese light novel series by Tetsuto Uesu with illustrations by Nekosuke Ōkuma. Seven volumes have been published by Shoten Kadokawa Shoten since 2012 under their Kadokawa Sneaker Bunko imprint. The first light novel volume was published on September 29, 2012, Seven volumes have been published as of January 2015.