Shinmai Maou No Testament -

: Basara, a former member of the Hero Clan, must protect Mio from various factions—including both demons and heroes—who seek the power she inherited from her father, the previous Demon Lord Wilbert.

Shinmai Maou no Testament (The Testament of Sister New Devil) is a light novel and anime series that blends high-stakes supernatural action with intense ecchi (erotic) themes. The story centers on Basara Toujou, a high school student who suddenly gains two stepsisters, Mio and Maria, only to discover they are the future Demon Lord and a succubus. Core Premise and Plot Shinmai Maou no Testament

: In an attempt to protect her, Basara enters into a master-servant contract with Mio. However, a "reverse" contract occurs, making Basara the master and Mio his servant. : Basara, a former member of the Hero