Shinmai Maou no Keiyakusha Wiki
Shinmai Maou no Testament X
Shinmai Maou Vol X.jpg
Zest, Maria, Mio, Kurumi, and Yuki standing behind Basara Toujou
Kana 新妹魔王の契約者X
Romaji Shin Imōto Maō no Keiyakusha X
Air/Release Date Febuary 01, 2017
ISBN ISBN 978-4041037485
Pages 388
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Volume X is the tenth light novel volume of Shinmai Maou no Keiyakusha.


The destruction of Tokyo !? A great decisive battle with the "Four Gods" that hinders the whereabouts of the swords!

Shiba's plan to rob the "Four Gods" exposed the brave clan's "darkness" and also upset the balance between the human world, the demon world, and the divine world. It was a sword change that chased after the Shiba, but Basara couldn't find a way to attack before Shiba's power that is far beyond imagination.


-Shiba releases the 4 gods, that are represented by the divine beasts Genbu, Seiryuu, Byakko, and Suzaku and allows them to run amok all over the various regions in Tokyo

-Basara and company attempts to stop him. The girls pretty much all have their own fights against a different beast with the exception of Maria who decides to fight against Balflear (He’s the demon dude who disappears when Liala was killing all the high ranking demons at the end of the anime.

-Ultimately the girls win their fights with the exception of Maria who ends up using her demon lord powers to save Mio. (Mio, Kurumi, and Zest’s wins are based on skill. Yuki gets a shonen-esque power up)

-The girls winning their fights only helped Shiba since it satisfied the conditions for awakening Kouryuu. Awakening Kouryuu basically gives Shiba everything he needs to take his revenge.

-Basara faces off against Shiba and as a result of their battle, he’s left in a state where he’s basically close to death. Chisato in her Afuriea form, flies through the barrier and stops Shiba from killing Basara.

-After saving everyone else and stabilizing Basara’s condition, Chisato is confronted by Mio, Maria, Yuki, and Zest. She’s basically forced to explain her relationship with Basara (She finally joins the harem in an official capacity since the other girls accept her)

-Eventually, Basara recovers from his wounds and wakes up. He doesn’t really have any idea how to stop Shiba and Kouryuu is about to awaken relatively soon. He asks Chisato if she can kill Shiba, but she isn’t allowed to kill him due to the agreement she made with the other gods when she first came to the human world.

-Chisato suggests that she could reverse engineer the process that Shiba used to awaken Kouryuu in order to power up Basara.  

-Basically, Mio, Maria, Kurumi, Yuki, and Zest all have particular elemental affinities. The master-slave contract is used as a base to transfer and reinforce each element. They basically have to go beyond the master-servant contract and perform the master-servant vow. Which requires that Basara takes their purity.

-After taking Mio’s virginity and absorbing her fire element, the volume literally ends with Basara getting ready to have sex with Maria and Kurumi.  


  • Novel Illustrations
  • Prologue-The Start of a Long Night
  • Chapter 1-What Those Eyes Gaze Upon
  • Chapter 2-What Lies Beyond the Four Beasts
  • Chapter 3-Completing the Master-Slave Contract
  • Epilogue-The Vows of Those Tied Together


Main Characters Returning Characters New Characters Antagonists
  • Albareos

Novel Illustration