Dororon! Okuni-chan

Girl power is justice! This thrilling story is about a young girl who assumes she can refine her "girl power" by defeating monsters. Due to unforeseen circumstances, Okuni—a second-year junior high school student—is ordered by Six (the beautiful sixth devil king) to suppress the violent monsters that plague the human world. The tale of this mistaken young girl is full of laughter and tears! (Source: Hero's, translated)