Mai-Otome

Mashiro-hime transfers to Garderobe, an all-girls school, hiding the fact that he is a boy. He escaped an all-boys school where he was looked down upon by disguising himself as the late princess Mashiro-hime. Because of his assumed royal status, the organization Schwarz seeks to assassinate him. At the same time, Mashiro tries to break his Contract with Arika Yumemiya, who unexpectedly becomes his Otome while protecting him from a member of Schwarz.