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What is The Testament of Sister New Devil?

Published in Anime Series Plot Summary 2 mins read

The Testament of Sister New Devil is the title of a fantasy anime series centered around the supernatural events that unfold in the life of a high school student named Basara Toujo. The "testament" in this context refers to the unfolding narrative and the unique premise of the series.

Unveiling the Premise of the Series

The story of The Testament of Sister New Devil begins when Basara Toujo's father suddenly remarries and then departs overseas, leaving Basara with two new, beautiful step-sisters. This seemingly normal familial arrangement quickly takes a supernatural turn as Basara soon discovers that his new siblings are far from ordinary.

Key Elements of the Testament:

  • Protagonist: The series follows Basara Toujo, a high school student whose life is irrevocably changed by his new family members.
  • Mysterious Step-Sisters: Basara's new step-sisters are revealed to possess extraordinary and dangerous identities:
    • Mio: She is actually the new Demon Lord. Her arrival marks a significant shift in the balance of power in the supernatural world.
    • Maria: Serving as Mio's companion and protector, Maria is a powerful succubus, adept at both combat and manipulation.
  • Unaware Beginnings: Initially, Basara is completely unaware of the true nature and immense power of his new step-sisters. This ignorance sets the stage for a series of events filled with action, drama, and unexpected revelations as he becomes entangled in their supernatural world.

The "testament" thus describes the unfolding narrative of Basara's life as he navigates cohabitation with a Demon Lord and a succubus, leading to various conflicts and alliances as he adapts to his new, perilous reality.