The Testament of Sister New Devil (Japanese: 新妹魔王の 契約者 テスタメント, Hepburn: Shinmai Maō no Tesutamento) is a Japanese light novel series written by Tetsuto Uesu and illustrated by Nekosuke Ōkuma. Twelve volumes have been published by Kadokawa Shoten since 2012 under their Kadokawa Sneaker Bunko imprint.
The Testament of Sister New Devil is an anime series adapted from the light novels of the same title by Tetsuto Uesu and Nekosuke Ōkuma. Produced by.
Little does he know, his new sisters, Mio and Maria are actually the new Demon Lord and a The Testament of Sister New Devil BURST (English Dub).