|Crunchyroll||US||Sub & Dub||Free|
|Funimation||AU||Sub & Dub||Free|
|VRV||US||Sub & Dub||Free|
When a pair of sexy girls, Maria and Mio, come to live with high school student Basara Toujou, his life changes forever. The two girls have a secret that they don’t keep for long—Maria is a succubus, and Mio is a future Demon Lord. But Basara has a secret of his own—he’s the last descendant from a clan of demon-fighting heroes. To make things even more complicated, the girls force Basara into a master-servant contract, and Basara ends up becoming their master! What happens when you put a succubus, a demoness, and a demon-fighting hero under the same roof? They form a bond that will help them to take on anything!
Alternative Titles: Shinmai Maou no Testament, Shinmai Maou no Keiyakusha, 新妹魔王の契約者〈テスタメント〉, Shinmai Maou no Testament: Toujou Basara no Hard Sweet na Nichijou (OVA1), The Testament of Sister New Devil: Burst (SS2), Shinmai Maou no Testament Burst: Toujou Basara no Shigoku Heiwa na Nichijou (OVA2), Shinmai Maou no Testament Departures (OVA3)