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
Japanese: 新妹魔王の契約者〈テスタメント〉
English: The Testament of Sister New Devil
More titles


Volumes: 13
Chapters: 75
Status: Finished
Published: Sep 29, 2012 to Mar 31, 2021
Genres: Action Action, Fantasy Fantasy, Romance Romance, Supernatural Supernatural, Ecchi Ecchi
Theme: Harem Harem
Serialization: None
Authors: Uesu, Tetsuto (Story), Ookuma, Nekosuke (Art)


Score: 7.501 (scored by 17241,724 users)
1 indicates a weighted score.
Ranked: #29472
2 based on the top manga page. Please note that 'R18+' titles are excluded.
Popularity: #2358
Members: 8,551
Favorites: 134

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Ranked #2947Popularity #2358Members 8,551
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Volumes: /13
Chapters: /75


"Hey, you said you wanted a little sister, right?" First year high school student, Toujou 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!

(Source: MU)


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May 16, 2022
Having finally read the last volume nearly one year after it came out, I can finally make a conclusive review on this series that feels I have been following for so long. I came across Shinmai Maou not through the anime but simply because I was curious about it after seeing some of the illustrations online, seriously if you haven't already, check out some of these illustrations, they honestly made me immediately wanna read the novel.

I disagree with the other review here, if you are in for the ecchi definitely pick the LN over the anime, as far as ecchi goes I haven't seen any ...
Dec 29, 2022
I watched the anime and read the manga but never read the LN. Having taken an interest for so long I finally read the LN. Honestly, the ecchi is quite good. I don't know why some reviewers say it's not good to read LN when it comes to ecchi. But, if you have good imagination, ecchi isn't a problem.

Story/plot: It's quite good. Not the best but I like it because of ecchi scenes were the main reason I read the LN. It's hard to put a good story and ecchi together because some readers are not into echhi and want to focus on understanding ...
Feb 22, 2020
Mixed Feelings
I don't know how you arrived here. Maybe you came from the anime and wanted to check the original material out, or maybe you already read a Light Novel like this and wanted to give another one a try. Before you decide on giving this one a go or skiping it, let me tell you what I thought of it.
The story doesn't start off too complex. The main character is a former member os the hero clan and his two addoptive sisters are from the demon clan. The main character wants to protect his family, and so they enter something called a Master-Slave Contract in ...

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Recent News

Japan's Yearly Manga & Light Novel Rankings for 2015

Japan's Yearly Manga & Light Novel Rankings for 2015

Here are the manga and light novel sales rankings for the fiscal year of 2015 (November 17, 2014 - November 22, 2015). Manga Sales by Series *1. 14,102,521 One more

Japan's Yearly Manga & Light Novel Rankings for 2015 (First Half)

Japan's Yearly Manga & Light Novel Rankings for 2015 (First Half)

Here are the Manga and Light Novel sales rankings for the first half of the fiscal year of 2015. (November 17, 2014 - May 17, 2015) Manga Sales by Series *1. 7,059, more

Recent Forum Discussion

Poll: Shinmai Maou no Testament Volume 13 Discussion
Hlebka - Apr 4, 2021
19 repliesby AkaTakuya »»
Sep 13, 2023 1:00 AM
How did it end??
00RATUL00 - Dec 23, 2021
1 repliesby rohan121 »»
Dec 23, 2021 7:15 AM
Is the 13th volume translated?
Calvita - Jul 16, 2021
2 repliesby Calvita »»
Jul 30, 2021 9:29 AM
This series became 100% legit Hentai with graphic details
xFresh11 - Apr 3, 2018
23 repliesby AngelMoncada »»
Oct 20, 2020 3:34 PM
is the novel still going or is it done with volume 10?
audac1ous - Sep 4, 2017
2 repliesby Xaelath »»
Oct 27, 2017 6:25 AM