Classroom of Mysteries

International Magic Academy.\nThe paradise of many talents and a sure way towards fame and power. This is where our story begins...\n\nOne day, a girl got lost on her first day and a mysterious boy from the E-1 class helped her. \n\n\"What? E-1? There are only A, B, C, D. How can you be from the...\" \n\nThe girl wanted to end her sentence, but the boy disappeared.\n\nWho is this boy?\n\nWhat is the...