The ability to fly is something that only 1 in 10,000 men will develop. In the world of common sense, Iris dreamed of flying, but she discovered her ability to fly at the age of 15. The only known woman to fly is Saint Angelina, who is said to have lived 700 years ago. Iris's life changes completely as she discovers her abilities. Iris joins the King's Sky Knights, a group that protects the kingdom from the giant bird "Dallion" and is admired by the people, as the only female knight, and she shows remarkable success in her life.The story revolves around Iris, who lives an irreplaceable life with the reliable knights who surround her. A story of battle and love.