The Testament of Sister New Devil

In this animated series, Basara Toujo, a high school student, finds himself in a precarious situation when his father remarries and he inherits two beautiful step-sisters. Unbeknownst to him, Mio and Maria are actually the new Demon Lord and a succubus! As Basara tries to navigate his new life, he accidentally forms a reverse contract with Mio, making him her 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, and Basara must step up to protect his new sister. With its blend of sci-fi, adventure, comedy, and animation, this series is sure to keep you on the edge of your seat.

You can stream The Testament of Sister New Devil on:

Some TV shows that have similar genres and were produced around the same time as The Testament of Sister New Devil include Rick and Morty, Sand Land: The Series, Danny Phantom, Ranking of Kings, Kuma Kuma Kuma Bear, Sarazanmai.