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The Testament of Sister New Devil (新妹魔王の契約者『テスタメント』), also known as Shinmai Maou no Keiyakusha, is a softcore erotic Light Novel written by Uesu Tetsuto and illustrated by Ookuma Nekosuke (Nitro+), published from September 2012 to August 2021.

It has two manga adaptations and an anime adaptation.