The series is set in a world with an alternate history, where magic exists and has been polished through modern technology. However, the ability to use magic is determined by genetics, limiting the amount of magicians in existence. Following the Third World War, the world's superpowers shifted to these four nations: The United States of North America (USNA), New Soviet Union, the Great Asian Alliance, and Japan. In Japan, the magic community is informally governed by the ten master clans in lieu of the government. Due to the limited amount of magicians, they are treated as commodity and are forced to enter magic related schools and professions. Nine magic high schools exist in Japan; they each specialize in different aspects of magic and are simply referred to by their numbers.