Through developing the ground breaking information transfer and material generation technology called "Mana", various problems, such as pollution and war have disappeared, and days of peace have arrived in the world. However, the people who receive the benefit of the Mana live in a false peace. Those who cannot use the Mana, named with the derogatory term "Norma", which are seen as an opposition to structures of society, live in oppression. Because this is the norm, the people who use Mana do not question it. The first princess of the Misurugi Empire, Angelise Ikaruga Misurugi, was convicted of the belief of exterminating the Norma. But when she turned 16, and she was baptised, her elder Brother, Jurio, exposed her as a Norma to the public. Angelise, who is bewildered by the revelation that she herself was a Norma all along, turns into a target of hate of the people in the blink of an eye. Ange is exiled to Arzenal, and then Ange starts her first day as a soldier Norma. This anime focuses on Ange who spend her stormy life.

Information Source: Wikipedia