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Shinmai Maou no Keiyakusha  
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"Hey, you said you wanted a sister, right?" First year highschool student, Toujo 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!


Related Series

Associated Names
По велению адской сестры
신 여동생 마왕의 계약자
New Sister Archfiend Testament
Shinmai Maou no Keiyakusha (Testament)
Shinmai Maou no Testament
The Testament of Sister New Devil

Groups Scanlating

Latest Release(s)
c.13 by CAT Scans (29d ago)
c.12 by CAT Scans (72d ago)
c.11.5 by CAT Scans (99d ago)
Search for all releases of this series

Status in Country of Origin
3 Volumes (Ongoing)

Completely Scanlated?

Anime Start/End Chapter

User Reviews


User Rating
Average: 8.1 / 10.0 (232 votes)
Bayesian Average: 7.95 / 10.0
 31% (71 votes)
 14% (32 votes)
 25% (57 votes)
 18% (41 votes)
 5% (12 votes)
 3% (6 votes)
 1% (2 votes)
 2% (4 votes)
 1% (2 votes)
 2% (5 votes)

Last Updated
September 3rd 2014, 4:42pm PST

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Original Publisher

Serialized In (magazine)
Comic Walker (Kadokawa Shoten)
Shounen Ace (Kadokawa Shoten)

Licensed (in English)

English Publisher

Activity Stats (vs. other series)
Weekly Pos #441 decreased(-32)
Monthly Pos #425 decreased(-300)
3 Month Pos #137 decreased(-38)
6 Month Pos #111 decreased(-31)

List Stats
On 2864 reading lists
On 576 wish lists
On 31 unfinished lists
On 219 custom lists

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User Comments [ Order by usefulness ]

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Rating: N/A
by NaStolen
May 11th, 2014, 11:44pm
I agree perrinaz, it somewhat resembles the lead characters in High School DxD(body structures and characteristics) and gives me some of the parts in the anime where female lead lives with the male lead.
The story is like Hagure Yuusha no Kichiku Bigaku,which were made by the same author, where the hero protects the demon lord.
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Rating: N/A
by perrinaz
April 27th, 2014, 12:54pm
Does this not remind anyone of Highschool DxD? We have a forearm that becomes armor. A red-headed Demon/Devil boss.
Disclaimer: I haven't read it yet -- and I plan to. I just thought it looked awfully similar at first glance.
Disclaimer's Disclaimer: HS DxD is in my top 2 fav's and so I wouldn't mind if they turned out similar.
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Rating: 3.0 / 10.0
by Jandalman
February 25th, 2014, 6:34pm
The art work of this series is good, story concept is interesting enough. However the extremely slow pace makes this series forgettable, and the cliffhangers are just frustrating as usual.
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Not bad   
Rating: 6.0 / 10.0
by sadomqfwpo
September 1st, 2013, 9:48pm
Actually pretty entertaining first 3 chapters honestly. I went in with extremely low expectations though. We've all read the X-millionth LN -> Manga adaptations and know how shitty they can be, but so far this seems to be doing alright and the art is really nice.

My suggestion: take your penis out and turn off your brain and you'll like it.

... Last updated on September 4th, 2013, 8:07pm
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Really good so far   
Rating: 10.0 / 10.0
by SSJR2
July 10th, 2013, 2:22pm
i didnt really know what to make out of the first chapter so i waited for the second one to write this and so far this looks pretty good. Its basically a fantasy manga in the modern world with demons other other beings. i like the plot so far,the art is great and i didnt know if the main character would be the classic random guy getting launch into a new setting but after chapter 2 the main character has my approval. anyway i hope this keeps going good
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