Date A Live III

Life has settled down into a calm state for Shido – or at least as calm as he can be when he's juggling the romantic interests of a half-dozen sealed Spirits and one aggressive classmate. Another spatial quake warning sends him out to a ruined amusement park to meet the newest Spirit, the green-haired Natsume, who dresses like a witch and uses magical powers to render AST attackers comically ineffective. Although things go well at first, he inadvertently offends her, and her retribution comes by pretending to be him and trying to ruin his reputation at school. When that effort ultimately gets thwarted by Origami and Tohka, she resorts to a much more involved plan that could result in one of the people around him disappearing.

Synopsis from Anime News Network