Cloudia, a world in the sky, where floating islands are scattered in the sea of clouds. Reinas, the cavalry platoon leader of the Kaisershult Empire, received the order of the king and went to conquer Badelsen Island with his ally Ronald. Reinas and Ronald launch a surprise attack on the command tower of the island. Reinas successfully conquered the command tower, but he was not satisfied with the military's way of slaughtering citizens and conflicted with Ronald. Reinas, who was convicted of treason, is chased from the Kaisershult army. Reinas, rescued by Bernheim and Nia, who were there by chance, goes to the magical kingdom of St. Mira on an airship and meets Hunt and Vice. The Reinas who prevented the invasion of St. Mira by the Kaisersult army had an audience with King St. Mira and heard the suspicious rumors of King Kaisersult and the existence of the Airgate. Reinas and the others were going to investigate the tower of the god of Ptelux, which is sealing the air gate...