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.

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. Basara meets his two new, cute stepsisters, Mio Naruse and Maria Naruse. īasara 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. A third OVA episode was released on March 28, 2018. A second OVA episode was released on January 26, 2016. The second anime television season premiered on October 9, 2015. The first OVA episode was released on June 22, 2015. The first season of an anime television adaptation premiered on January 7, 2015. A second manga adaptation has been serialized in Hakusensha's Young Animal Arashi magazine since February 2014. A manga adaptation has been serialized in Kadokawa Shoten's Shōnen Ace magazine since May 2013. Thirteen volumes have been published by Kadokawa Shoten since 2012 under their Kadokawa Sneaker Bunko imprint. The Testament of Sister New Devil ( Japanese: 新妹魔王の契約者 ( テスタメント ), Hepburn: Shinmai Maō no Tesutamento) is a Japanese light novel series written by Tetsuto Uesu and illustrated by Nekosuke Ōkuma.

Takao Yoshioka (Series Composition Supervision).

Shinmai maou no testament dubbed