The Testament of Sister New Devil is a Japanese light novel series written by Tetsuto Uesu and illustrated by Nekosuke Ōkuma. Twelve volumes have been published by Kadokawa Shoten since 2012 under their Kadokawa Sneaker Bunko imprint. A manga adaptation has been serialized in Kadokawa Shoten's Shōnen Ace magazine since May 2013. A second manga adaptation has been serialized in Hakusensha's Young Animal Arashi magazine since February 2014. The first season of an anime television adaptation premiered on January 7, 2015. The first OVA episode was released on June 22, 2015. The second anime television season premiered on October 9, 2015. A second OVA episode was released on January 26, 2016. A third OVA episode was released on March 28, 2018.
Plot
Basara Tojo is a high school student studying at Hijirigasaka Academy when his father Jin suddenly gets "remarried" and asks Basara if he wants to have sisters. Basara meets his two cute stepsisters, Mio Naruse and Maria Naruse. After his father departs overseas, Basara quickly finds that the two sisters are actually part of a demon clan, and he is meant to be with the hero clan. Mio, a Demon princess, forcibly attempts to make a master and servant contract with Basara, but Maria has it end up being the opposite, with Basara as the master. Basara is then always getting into ecchi scenarios, more the while, to protect Mio from being pursued by other demons who are after her heritage passed down by the former Demon Lord Wilbert.
The first light novel volume was published on September 29, 2012, under Kadokawa Shoten's Kadokawa Sneaker Bunko imprint. Twelve volumes have been published as of April 2018.
Manga
A manga adaptation with art by Kashiwa Miyako began serialization in Kadokawa Shoten's shōnen manga magazine Shōnen Ace in the July 2013 issue, released on May 25, 2013. A second manga adaptation, titled Shinmai Maō no Testament: Arashi!, focusing on the antics of Maria with art by Fumihiro Kiso, began serialization in Hakusensha's seinen manga magazine Young Animal Arashi on February 7, 2014. Both series have been licensed for publication in North America by Seven Seas Entertainment.
Anime
An anime television adaptation premiered on January 7, 2015. The opening theme is "Blade of Hope" by sweet ARMS and the ending theme is "Still Sis" by Kaori Sadohara. A second season titled The Testament of Sister New Devil BURST premiered on October 9, 2015. The anime is licensed in North America by Crunchyroll, with Funimation handling the home video release. Anime Limited released the series in the UK.
