The Girl on the Cloud Battleship

Osmon Chira was an utterly ordinary boy who dreamed of joining the people of the Heavenly Army and serving aboard its main force: the Cloudships, super spacecraft enhanced by combining human technology with the magic of magical beasts. Through a strange turn of events, Osmon disguised himself as a girl and boarded a Cloudship to follow his older sister, Osli. He became a member of the Empire's Heavenly Army. What will become of Osmon?