The Testament of Sister New Devil

    Completed | 47 chapters
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    • Basara's world turns upside down when he learns that his adopted sisters are part of a demon clan
    • An accident prompts them into a contract with the demon princess, except Basara is now the master
    • As a descendant of the hero clan, he protects her from those after her demon heritage
    "Hey, you said you wanted an little sister, right?" First year high school 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!






    PublishedMay 25, 2013 to Apr 26, 2017
    SerializationYoung Animal Arashi
    Original PublisherHakusensha
    English PublisherSeven Seas
    Last UpdatedAugust 9, 2018
    Other namesThe Testament of Sister New Devil, Shinmai Maou no Keiyakusha, The Testament of Sister New Devil, Shinmai Maou no Testament, Shinmai Maou no Keiyakusha, 新妹魔王の契約者〈テスタメント〉, 新妹魔王の契約者
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    Vol.9 Pact After: The Toujou Family: Afterword [END]Aug 9, 2018more_horiz
      Vol.9 Last PactAug 9, 2018more_horiz
        Vol.9 Pact 39.5: [Side Story] Go with MariaAug 9, 2018more_horiz
          Vol.9 Pact 39: ReturnAug 9, 2018more_horiz
            Vol.9 Pact 38: A Score SettledAug 9, 2018more_horiz
              Vol.9 Pact 37: Runic SwordAug 9, 2018more_horiz
                Vol.9 Pact 36: Mio's AwakeningAug 9, 2018more_horiz
                  Vol.8 Pact 35.5: Behind the False SmileApr 10, 2018more_horiz
                    Vol.8 Part 35: The Results of The DecisionApr 10, 2018more_horiz
                      Vol.8 Pact 34: The Demon Sword GramrApr 10, 2018more_horiz
                        Vol.8 Pact 33: Everything War for This MomentApr 10, 2018more_horiz
                          Vol.8 Pact 32: MasterApr 10, 2018more_horiz
                            Vol.8 Pact 31: Basara VS. MariaJul 8, 2018more_horiz
                              Vol.7 Pact 30.5: Maria the Graphic NovelistJul 8, 2018more_horiz
                                Vol.7 Pact 30: KeyJul 8, 2018more_horiz
                                  Vol.7 Pact 29: Parting and ReunionJul 8, 2018more_horiz
                                    Vol.7 Pact 28.5: The Testament of Sister New DevilJul 8, 2018more_horiz
                                      Vol.7 Pact 28: Betrayal and ConnectionsJul 8, 2018more_horiz
                                        Vol.7 Pact 27: Betrayal, and Then...Aug 30, 2016more_horiz
                                          Vol.6 Pact 26.5: An Average Day in the Life of Toujou BasaraJul 8, 2018more_horiz
                                            Vol.6 Pact 26: The Ups and Downs of a Wavering PactJul 8, 2018more_horiz
                                              Vol.6 Pact 25: The Second Servant-Master ContractJul 8, 2018more_horiz
                                                Vol.6 Pact 24: The Sexy Lil' Succubus' Rampage: Part 2Jul 8, 2018more_horiz
                                                  Vol.6 Pact 23: The Sexy Lil' Succubus' RampageJul 8, 2018more_horiz
                                                    Vol.5 Pact 22: Conclusion and PartingJul 8, 2018more_horiz
                                                      Vol.5 Pact 21: What A Man Believes InSep 4, 2017more_horiz
                                                        Vol.5 Pact 20: Time For A ReckoningAug 30, 2016more_horiz
                                                          Vol.5 Pact 19: Unwavering Resolve and What Comes From ItAug 30, 2016more_horiz
                                                            Vol.4 Special: A Day in the Life of Maria-chanAug 30, 2016more_horiz
                                                              Vol.4 Pact 18: Feelings Riding Upon a BladeAug 30, 2016more_horiz
                                                                Vol.4 Pact 17: Wanting to Protect Before Being WarnedAug 30, 2016more_horiz
                                                                  Vol.4 Pact 16: Intersecting DestiniesAug 30, 2016more_horiz
                                                                    Vol.4 Pact 15: Gazing Upon the Unfading PastAug 30, 2016more_horiz
                                                                      Vol.3 Pact 14: The Direction of Master-Servant TrustAug 30, 2016more_horiz
                                                                        Vol.3 Pact 13: Face to Face with HostilityAug 31, 2017more_horiz
                                                                          Vol.3 Pact 12: The Demon Lord and the HeroAug 30, 2016more_horiz
                                                                            Vol.3 Pact 11: Mornings, Little Sisters and The Ultimate Demon LordAug 30, 2016more_horiz
                                                                              Vol.2 Pact 10: What I Want to ProtectAug 30, 2016more_horiz
                                                                                Vol.2 Pact 9: Until Your Sorrow Has Gone (Part 3)Aug 30, 2016more_horiz
                                                                                  Vol.2 Pact 8: Until Your Sorrow Has Gone (Part 2)Aug 30, 2016more_horiz
                                                                                    Vol.2 Pact 7: Until Your Sorrow Has Gone (Part 1)Aug 30, 2016more_horiz
                                                                                      Vol.2 Pact 6: Allies and EnimiesAug 30, 2016more_horiz
                                                                                        Vol.1 Pact 5: The Space Between Reunion and Trust (End)Aug 30, 2016more_horiz
                                                                                          Vol.1 Pact 4: The Space Between Reunion and Trust (Beginning)Aug 30, 2016more_horiz
                                                                                            Vol.1 Pact 3: The First Master-Servant PactAug 30, 2016more_horiz
                                                                                              Vol.1 Pact 2: The Demon Lord and the HeroAug 30, 2016more_horiz
                                                                                                Vol.1 Pact 1: How to Assault Your Little SisterAug 30, 2016more_horiz