: 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.
: 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. Shinmai Maou no Testament
: The series features complex family dynamics, later revealing that many of the main characters are actually cousins, adding a controversial incestuous element to the relationships. Key Characters : Basara, a former member of the Hero