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]] ([[nitroplus|Nitro+]]), published from September 2012 to August 2021.

It has two manga adaptations and an anime adaptation.

h4. Characters
* [[Hasegawa Chisato]]
* [[Naruse Mio]]
* [[Zest]]

h4. External links
* Wikipedia entry: "The Testament of Sister New Devil":[https://en.wikipedia.org/wiki/The_Testament_of_Sister_New_Devil]
新妹魔王の契約者 新妹魔王的契約者 新妹魔王的契约者 The_Testament_of_Sister_New_Devil