The Testament of Sister New Devil

2015

Original language: Japanese

animation
action & adventure
comedy
sci-fi & fantasy

The story

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!

What it’s like

Bright, saturated anime colors with bedroom-comedy staging: pastel interiors, a sunlit suburban house, and cheerful, bouncy character animation that turns ordinary domestic moments into sight gags. The sound is light and playful, with quick comic timing, pop-leaning incidental music, and voice performances that lean into exaggerated reactions. Its vibe is breezy, flirtatious, and silly, best suited to a lazy evening, a comfort rewatch, or background viewing when you want something undemanding. Episodes move in brisk, gag-driven bursts, with short fights and chase sequences breaking up the romantic-comedy banter. Emotionally it stays light and teasing, and the central relationship is a slowly warming household dynamic in which a bewildered teenager is pulled into chaos with his new step-family. Expect frequent fanservice and suggestive humor, plus cartoon action where demons and rival fighters are pursuing the household; the peril is brief and stylized rather than grim, with little gore. It suits viewers who enjoy harem comedy, supernatural high-school settings, and playful ecchi humor, and it is not a fit for anyone seeking gentle, fanservice-free viewing.

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