Mai-Otome

A student at an all-girls school is actually male, having disguised himself as the late Mashiro-hime to escape an all-boys school where he was mistreated. His deception is complicated by an organization called Shwarz, which is attempting to assassinate him due to his royal status. Meanwhile, he seeks to end a Contract with Arika Yumemiya, who has become his Otome to protect him from a Shwarz member.