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Toujou Basara is a high school student whose father has suddenly just remarried. His father then departs overseas leaving Basara with two new beautiful step-sisters. Little does he know, his new sisters, Mio and Maria are actually the new Demon Lord and a succubus!? Almost trapped into a life of servitude, Basara forms a reverse contract by accident and ends up becoming Mio's master! Hijinks ensue as Basara finds himself in one ecchi situation after another. However, Mio's life is in danger as she is pursued by demons and heroes!

Series Cast

  1. Tomokazu Sugita as Yahiro Takigawa (voice), Lars (voice), and White Mask (voice)

    Tomokazu Sugita

    Yahiro Takigawa (voice), Lars (voice), White Mask (voice)

    29 Episodes

  2. Yuichi Nakamura as Basara Tōjō (voice)

    Yuichi Nakamura

    Basara Tōjō (voice)

    23 Episodes

  3. Ayaka Asai as Mio Naruse (voice)

    Ayaka Asai

    Mio Naruse (voice)

    23 Episodes

  4. Kaori Fukuhara as Maria Naruse (voice)

    Kaori Fukuhara

    Maria Naruse (voice)

    23 Episodes

  5. Sarah Emi Bridcutt as Yuki Nonaka (voice)

    Sarah Emi Bridcutt

    Yuki Nonaka (voice)

    22 Episodes

  6. Keiji Fujiwara as Jin Tōjō (voice)

    Keiji Fujiwara

    Jin Tōjō (voice)

    16 Episodes

  7. Seiko Yoshida as Zest (voice)

    Seiko Yoshida

    Zest (voice)

    16 Episodes

  8. Yuu Asakawa as Chisato Hasegawa (voice)

    Yuu Asakawa

    Chisato Hasegawa (voice)

    15 Episodes

  9. Iori Nomizu as Kurumi Nonaka (voice)

    Iori Nomizu

    Kurumi Nonaka (voice)

    14 Episodes

  10. View More

Full Cast & Crew

Last Season


2015 • 10 Episodes

Basara Toujou has a hard life. He is the older step-brother to two demonic sisters, Mio and Maria Naruse, whom he protects from entitled demons looking to claim Mio's power for themselves. On top of that, rising political tension within the demon realm only makes his job more difficult. When a messenger arrives with summons for Mio to the demon realm, she and her friends go in spite of the danger. Now on the enemy's turf, Basara will have to grow stronger through erotic pleasure in order to do the impossible and protect everyone.

The Consequences of What Must Be Done

(2x10, December 11, 2015) Season Finale

View All Seasons

The Testament of Sister New Devil
The Testament of Sister New Devil


Original Name 新妹魔王の契約者

Status Ended


  • See more TV shows from Tokyo MX...

Type Scripted

Original Language Japanese


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  • Created by credit

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