Shinmai Maou no Testament
The Testament of Sister New Devil
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Shinmai Maou no Testament

Alternative Titles

Synonyms: Shinmai Maou no Keiyakusha, The Testament of Sister New Devil
Japanese: 新妹魔王の契約者〈テスタメント〉
English: The Testament of Sister New Devil
More titles


Type: Manga
Volumes: 9
Chapters: 46
Status: Finished
Published: May 25, 2013 to Apr 26, 2017
Genres: Action Action, Fantasy Fantasy, Romance Romance, Ecchi Ecchi
Demographic: Shounen Shounen
Serialization: Shounen Ace
Authors: Uesu, Tetsuto (Story), Kashiwa, Miyako (Art)


Score: 7.211 (scored by 48074,807 users)
1 indicates a weighted score.
Ranked: #50072
2 based on the top manga page. Please note that 'R18+' titles are excluded.
Popularity: #916
Members: 15,392
Favorites: 146

External Links

Ranked #5007Popularity #916Members 15,392
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Volumes: /9
Chapters: /46
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"Hey, you said you wanted an little sister, right?" First year high school student, Toujo Basara, was suddenly asked by his farther 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!

(Source: MU)


Shinmai Maou no Testament has been published in English as The Testament of Sister New Devil by Seven Seas Entertainment since January 19, 2016. It has also been published in Italian and Brazilian Portuguese by Panini Comics under the Planet Manga imprint since June 6, 2015 and July 2016, respectively.

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More reviewsReviews

Oct 14, 2021
hexashadow13 (All reviews)
tl;dr: A solid story involving an interesting cast though told in a manner that doesn’t feel as exciting as it could be.

This is the manga adaptation of a light novel series that also received two anime seasons and a film. I have already seen the anime and am quite fond of it, and thus this review is going to be from the perspective of someone that had already seen the anime and liked it but was looking for more media related to it.

The best part about this series is the good and likable cast in a story that has a solid combination of action, romance, read more
Oct 21, 2014
kkaa031 (All reviews)
First of all, let me say that however much I will insult this manga, I did enjoy it to the fullest. This manga by UESU Tetsuto and MIYAKO Kashiwa is about a first year highschool student, Toujo Basara, getting two new stepsisters after his father remarries. Before he knows it, his life gets turn upside down.


The story starts off as a generic romance-incest-ish manga, but turns into so much more. It does develop the story well, but personally, I feel that they should focus more on the plot instead of adding unrelated scenes for the purpose of adding the ecchi tag on this read more


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