The Testament of Sister New Devil

"Hey, you said you wanted a little sister, right?" First year highschool 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 one ecchi situation 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!

TV series created in 2015 and concluded in 2018 by Takao Yoshioka, Hisashi Saito.
The show consists of 4 seasons and 27 episodes.


S01E12 : For This Night, This Moment 8.09/10 (11 voting)


S01E01 : The Day I Got a Little Sister 7.87/10 (16 voting)




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  • banner
  • Original title


  • Type

    TV series

  • Episodes

    4 Seasons • 27 Episodes

  • Rating

    6.96/10 (470 voting)

  • Popularity : 100%

  • Country of origin


  • Original language(s)


  • Running time

    24 :

  • Website


  • Status