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Shinmai Maou no Keiyakusha Wiki is dedicated to the Light Novel series The Testament of Sister New Devil (新妹魔王の契約者（テスタメント） ) written by Uesu Tetsuto and illustrated by Ōkuma Nekosuke (Nitro+) with twelve volumes released since September 2012. The manga adaptation is written again by Uesu Tetsuto but is drawn by Miyakokasiwa and has been serialized since May 2013. Another seinen version of the manga is illustrated by Fumihiro Kiso and began serialization in February 2014. An anime adaptation directed by Hisashi Saito aired in 2015.

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"Hey, you said you wanted a little sister, right?" High school freshman, Basara Tojo, was suddenly asked this question by his father who tells him that he's getting remarried. He then departed overseas after bringing Basara two beautiful step-sisters; Mio and Maria. But the true forms of the two girl's are actually a newbie Demon Lord and a succubus! Basara was almost forced into a master-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 situations one after another due to the contract, but Mio's life is being pursued by other demon tribes and hero clan!! The most powerful contractor's desire action drama begins!

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Light Novel Volume XII releases April 1st, 2018! New!
Shinmai Maou No Testament Departures DVD/BD releases on March 28,2018 New!
Shinmai Maou No Testament Ecstasy BD collection releases on February 23,2018 New!
Shinmai Maou No Testament Departures two week theatrical run began on January 27th 2018 New!
Light Novel Volume XI was released on November 1st, 2017! New!
Shinmai Maou No Testament English Dub released on October 31st, 2017 New!
Light Novel Volume X was released on February 1st, 2017! New!
Shinmai Maou no Keiyakusha Arashi Manga Volume 5 was released on August 29th, 2016! New!
Shinmai Maou no Keiyakusha Manga Volume 8 was released on August 26th, 2016! New!
Seven Volumes of the Light Novel has been translated by Baka-Tsuki!
Crowdfund for light novels 8-12 and side stories Shinmai Maou Translation
Shinmai Maou no Keiyakusha Wiki has been affiliated with High School DxD Wiki and Madan no Ou to Vanadis Wiki!

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Basara Toujou Basara Toujou (東城刃更 Tōjō Basara)The main Protagonist of the series and one of the the strongest Heroes in the series an ex-member of the Hero-clan. He lives with his two step sisters who are both Demons. Basara is determined no matter what to protect his loved ones no matter what he has to face in the future. Read more.

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Shinmai Maou no Testament and Shinmai Maou no Testament Storm! are both licensed by Seven Seas Entertainment. Please support the official english versions of both mangas.

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