Following World War III, the Führer established the Unified World Government. Anything deemed detrimental to the creation of the "Perfect World" is eliminated, including people with disabilities, adherents of other religions, those labeled as "traitors," and so on. The Black Rose serves as the Führer's personal protection unit. Luka Oogami, the top graduate of the unified army officers' academy, joins the Black Rose... to save the world.