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Watch The Testament of Sister New Devil full episodes online English sub.
Other titles: Shinmai Maou no Testament, Shinmai Maou no Keiyakusha
Synopsis: “Hey, you said you wanted a little sister, right?” First-year high school student, Toujo Basara, was suddenly asked by his father and fell into a state of panic. On top of that, the eccentric father told him he will be getting remarried.
He then departed overseas after bringing Basara two beautiful step-sisters. But Mio and Maria’s true forms are actually the newbie Demon Lord and a succubus!?
Language: English Sub
Aired: Jan 8, 2015 to Mar 26, 2015
Genres: Action, Ecchi, Fantasy, Harem, Romance
Sources: Myanimelist, Wikipedia