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A succubus is a demon who feeds on men's life energy. Richille, a fallen succubus who lacks sensuality and magical powers is sent to the human world to learn about seduction. There she meets Yui, a human who hates demons. Richille who wants Yui decides to make him the target of her seduction...!? But in the midst of that, something unprecedented happens...!? (Source: Shoujo Crusade)