The Testament of Sister New Devil
新妹魔王の契約者
Toujou Basara is a high school student whose father has suddenly just remarried. His father then departs overseas leaving Basara with two new beautiful step-sisters. Little does he know, his new sisters, Mio and Maria are actually the new Demon Lord and a succubus!? Almost trapped into a life of servitude, Basara forms a reverse contract by accident and ends up becoming Mio's 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!
Ratings
Based on audience scoresWhere to stream The Testament of Sister New Devil
Streaming now in the United States on Crunchyroll.
Rent or buy in the United States on Apple TV Store.
Trailers and promos
The Testament of Sister New Devil: Season 1 - Trailer
The Testament of Sister New Devil Complete Season 1 - Official Trailer
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Frequently asked questions about The Testament of Sister New Devil
Where can I watch The Testament of Sister New Devil in the United States?
The Testament of Sister New Devil is available to stream on Crunchyroll in the United States, and to rent or buy on Apple TV Store. Streaming availability is provided by JustWatch and can change over time.
Can I watch The Testament of Sister New Devil for free?
Not free in the United States right now. The Testament of Sister New Devil needs a subscription to Crunchyroll, or you can rent or buy it on Apple TV Store.
What are the ratings for The Testament of Sister New Devil?
The Testament of Sister New Devil scores 7.9 on The Movie Database.
Who stars in The Testament of Sister New Devil?
The Testament of Sister New Devil stars Yuichi Nakamura, Ayaka Asai, Kaori Fukuhara, Tomokazu Sugita, and Yuu Asakawa.
How many seasons of The Testament of Sister New Devil are there?
The Testament of Sister New Devil has 2 seasons and 22 episodes, and is ended.
How long does it take to watch all of The Testament of Sister New Devil?
All 22 episodes of The Testament of Sister New Devil add up to about 8 hours 48 minutes at roughly 24 minutes each. At two hours a night that is about 4 evenings; at four hours a day it takes about 2 days.
What network is The Testament of Sister New Devil on?
The Testament of Sister New Devil airs on Tokyo MX, and is produced by Production IMS.
What language is The Testament of Sister New Devil in?
The Testament of Sister New Devil is in Japanese, and its original title is 新妹魔王の契約者.
Ratings and streaming availability are aggregated from third-party sources; metadata from The Movie Database (TMDB), streaming data from JustWatch. This product uses the TMDB API but is not endorsed or certified by TMDB. Streaming availability checked September 2026.