Shun Asanaga, a 15-year-old junior high school student, has a positive and upbeat disposition. One day, he discovers a weird crystal in his father's office, a scientist and businessman. When Shun touches it, the universe gets twisted, and he is transported to Endra's reality. Emilio, a prince of the country of Endra, is about to turn 16 and despises the ruling monarch, Delzain. Emilio, now that he is of legal age to inherit the throne, takes up a sword and seeks vengeance. Emilio, on the other hand, gets arrested by Delzain and imprisoned because he is too weak. When Emilio is in mourning, the wall of his cell distorts, and Shun arrives from there with two men.