71%
6.5 (4.2k)Age rating
United Kingdom 
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We couldn’t find any streaming options in India, but The Testament of Sister New Devil is available in the United States and 35 other countries on Crunchyroll, Crunchyroll Amazon Channel, and 12 other services.
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!
