Shinmai Maō no Testament (新妹魔王の契約者 Shinmai Maō no Tesutamento officially translated as The Testament of Sister New Devil) is a Japanese light novel series by Tetsuto Uesu with illustrations by Nekosuke Ōkuma. Four volumes have been published by Kadokawa Shoten since 2012 under their Kadokawa Sneaker Bunko imprint.
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