The series is based on the light novel by the same name, The Testament of Sister New Devil in English. It is written by Tetsuto Uesu and illustrated by Nekosuke Ōkuma. There are two manga adoptions, an OVA and a new OVA coming out next year. Read the synopsis and watch the trailer after the break.

“Hey, you said you wanted a little sister, right?” First year highschool 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!? Basara was almost entered into a master and servant contract with Mio, but a “reversed” contract was formed by mistake, and Basara is now the master!? Moreover, Basara is being hit by ecchi situation one after another due to the contract, but Mio’s life is being pursued by other demon tribes and hero tribes!! The most powerful contractor’s desire action drama begins!

“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!?

Second season of Shinmai Maou no Testament series. (courtesy of MAL)

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Photo Credit: Shinmai Maou no Testament Burst, Production IMS Co., Ltd.