Mai Tokiha transfers to Fuka Academy and learns that she along with several other girls at the school are HiMEs. Initially, the girls face off against monsters and a nefarious foreign organization. But when they learn of their true purpose at Fuka Academy, the girls must fight to save the world and protect what's most important to them.
(taken from Wiki.)

Picture	Real Name	Description
	Mai Tokiha	Mai is a recent transfer student to Fuka Academy and the heroine. She takes part-time jobs as a hobby and to support herself and her brother Takumi.
	Natsuki Kuga	Natsuki is a loner and truant who seeks revenge against the First District. She ends up working with Mai and Mikoto.
	Mikoto Minagi	Mikoto is a physically strong, naïve girl who is quite attached to Mai and her cooking. She carries her sword, Miroku, around with her.