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, is ordered by the king and goes to conquer Badelsen Island with his ally Ronald. Reinas and Ronald launch a surprise attack on the command tower of the island. Reinus successfully conquered the command tower, but he was not satisfied with the military's way of slaughtering citizens and confronted with Ronald. Reinas, who was convicted of treason, is chased from the Kaisershult army. The increasing number of mysterious magical beasts, the suspicious rumors of King Kaisersult, and the entrance to a different space. The journey of Reinus, where various fates intersect, begins now...