Shinmai Maou no Keiyakusha

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This project has been updated within the past 3 months.

Volume 1 Cover

Shinmai Maou no Tesutamento (新妹魔王の契約者テスタメント) series is written by Tetsuto Uesu and illustrated by Nekosuke Ookuma. It is being published by Kadokawa under their Sneaker Bunko label. The series currently has 9 volumes released. An anime adaptation aired between January 8, 2015 to March 26, 2015, covering the first three volumes of the light novel. A second season aired between October 9, 2015 – December 11, 2015.

Shinmai Maou no Keiyakusha is also available in the following languages:

Story Synopsis

"Hey, you said you wanted a little sister, right?" First year highschool student, Toujo Basara, was suddenly asked this question by his father, and he fell into a state of panic. On top of that, the eccentric father told him that 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 a newbie Demon Lord and a succubus!? Basara was almost forced 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 situations 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!

Series Information

  • Genre: Action, Ecchi, Fantasy, Romance, Shounen
  • Original Title: 新妹魔王の契約者(テスタメント)
  • Author: Tetsuto Uesu
  • Illustrator: Nekosuke Ookuma
  • Published Volumes: 10
  • Series Status: Ongoing


Format Standards

Every chapter (after editing) must conform to the general format guidelines.

Registration page

Translators are asked to Register the chapters they want to work on.

Feedback Thread

If you enjoyed the translation, why don't you tell us at the Feedback Thread.


  • 11th May 2017 - Volume 7 Chapter 3 completed.
  • 26th October 2016 - Volume 7 Chapter 2 completed.
  • 1st August 2016 - Volume 3 Afterword completed.
  • 3rd July 2016 - Volume 2 Afterword completed.
  • 26th June 2016 - Volume 1 Afterword completed.
  • 25th June 2016 - Volume 7 Chapter 1 completed.
  • 2nd May 2016 - Volume 6 Chapter 3 completed.
  • 23rd April 2016 - Volume 6 Chapter 4 completed.
  • 9th April 2016 - Volume 4 Chapter 3 completed.
  • 8th March 2016 - Volume 3 Chapter 3, Volume 5 Chapter 4, Volume 6 Chapter 1, Volume 7 Prologue completed.
  • 3rd March 2016 - Volume 3 Epilogue completed.
  • 1st January 2016 - Volume 5 Chapter 2 completed.

Older updates can be found here.

Shinmai Maou no Keiyakusha by Tetsuto Uesu

Volume 1 (Full Text)

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Volume 2 (Full Text)

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Volume 3 (Full Text)

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Volume 4 (Full Text)

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Volume 5 (Full Text)

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Volume 6 (Full Text)

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Volume 7 (Full Text)

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Volume 8

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Volume 9

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Volume 10

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Volume 11

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Shinmai Maou no Keiyakusha Side Stories


Bundled with BD Volume 1 of the first season

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Volume 8 Side Story

12 page booklet containing an SS, bundled with the special edition of Volume 8

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  • Wishing to Santa Claus

Project Staff

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Series Overview