Shinmai Maou no Keiyakusha

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An adult is defined as one who as reached the age of majority in their country. This project contains material intended for viewing only by mature audiences. For example, it may have extreme dialogue, scenes that are of a sexually explicit nature, or describe violence and cruelty.

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Volume 1 Cover

The Shinmai Maou no Tesutament (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 published by Kadokawa under their Sneaker Bunko label. The series currently has 12 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 named Shinmai Maou no Testament BURST aired between October 9, 2015 – December 11, 2015, covering the fourth to seventh volumes of the light novel. An OVA belonging to the second season premiered on January 26, 2016. A new animated project in the form of a 60-minute OVA titled Shinmai Maou no Testament Departures was released on March 28, 2018.

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

Story Synopsis

"Hey, you said you wanted a little sister, right?" First year high school 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: 12
  • Series Status: Ongoing


Format Standards

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

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  • 12th January 2019 - Volume 9 Prologue & Chapter 1 completed.
  • 12th October 2018 - Volume 8 completed.
  • 7th November 2017 - Volume 7 Chapter 4, Epilogue, and Afterword completed.
  • 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 (Full Text)

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Volume 9

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Volume 10

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Volume 11

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Volume 12

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Volume 13

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Volume Light!

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Volume Sweet!

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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

  • Supervisor:
  • Project Manager:







Series Overview

  • 新妹魔王の契約者I (September 29, 2012 ISBN 978-4-04-100495-1-C0193)
  • 新妹魔王の契約者II (January 31, 2013 ISBN 978-4-04-100670-2-C0193)
  • 新妹魔王の契約者III (June 1, 2013 ISBN 978-4-04-100860-7-C0193)
  • 新妹魔王の契約者IV (November 1, 2013 ISBN 978-4-04-101061-7-C0193)
  • 新妹魔王の契約者V (April 1, 2014 ISBN 978-4-04-101297-0-C0193)
  • 新妹魔王の契約者VI (September 1, 2014 ISBN 978-4-04-101433-2-C0193)
  • 新妹魔王の契約者VII (January 1, 2015 ISBN 978-4-04-102268-9-C0193)
  • 新妹魔王の契約者VIII (July 1, 2015 ISBN 978-4-04-102576-5-C0193)
  • 新妹魔王の契約者LIGHT! (September 30, 2015 ISBN 978-4-04-103691-4-C0193)
  • 新妹魔王の契約者IX (December 1, 2015 ISBN 978-4-04-103747-8-C0193)
  • 新妹魔王の契約者SWEET! (August 1, 2016 ISBN 978-4-04-104654-8-C0193)
  • 新妹魔王の契約者X (February 1, 2017 ISBN 978-4-04-103748-5-C0193)
  • 新妹魔王の契約者XI (November 1, 2017 ISBN 978-4-04-105173-3-C0193)
  • 新妹魔王の契約者XII (April 1, 2018 ISBN 978-4-04-106815-1-C0193)