Finally I completed the Shinmai Maou manga series! (the Italian edition, because I live in Italy) I really appreciated it, even if it is not a complete adaptation of the LN! :
Shinmai Maou no The Testament of Sister New Devil Vol.7 Limited Manga w/Blu-ray | eBay
Shinmai Maou No Testament png | PNGWing
Shinmai Maou no Testament (light novel) | Shinmai Maou no Keiyakusha Wiki | Fandom
Read Shinmai Maou No Testament Arashi! Chapter 12 on Mangakakalot
Shinmai Maou no Testament (The Testament Of Sister New Devil) - Zerochan Anime Image Board
Shinmai Maou No Testament Arashi! (2014) n° 4/Hakusensha | Guia dos Quadrinhos