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Akuto Sai planned on becoming a priest, but the Oracle that Constant Magic Academy uses instead of aptitude tests had an entirely different idea. Now he's been prophesied to become the Demon King, and no one will believe that he's really a nice guy! So, the nice ninja girl he likes wants to eliminate him, there's a female android living in his dorm's closet spying on him, plus a witch lusting after his powers... And every time Akuto tries to do something to disprove the Oracle's judgement, things get even worse and girls keep losing their clothes in the process. But you know what they say about chicks digging the bad boys? It's apparently true, because those same girls all somehow seem to keep ending up in the rapidly swelling harem of the boy who will become DEMON KING DAIMAO!