Castle College is a private university located in the outer suburb of Chicago in the Great Lakes region of Illinois, USA. It is a friendly school with the University of Chicago and has extensive academic exchanges. Its surface is the study of ancient reptiles, but its true face is a professional school of dragon slaying established by half-blood dragons, named after the German family of dragon slayers "Kassel". Students usually arrive at Chicago Railway Station by CC 1000 express train or directly by helicopter. University courses include Magic Machinery Design, Alchemy Chemistry, Lingxue, Cournot Language, Taiji Biography and Dragon Family Tree. The ultimate goal of all courses is to slaughter dragons.