The game focuses on the stories of Class Zero, a group of twelve magic-endowed students from the Peristylium, a magical academy in the Dominion of Rubrum. One day, the Milites Empire launches an assault on the other nations of Orience, seeking to control their respective crystals. When Rubrum is attacked, Class Zero are called into action and become entangled in both the efforts to push back and defeat the forces of Milites, and the secret behind the war and the existence of the crystals. The setting and presentation was inspired by historical documentaries, and the story itself was written to be darker than other Final Fantasy titles. - Wikipedia