Straightforward and innocent Hisone Amakasu is a Self-Defense Force rookie stationed at the Air Self-Defense Force's Gifu Base. She struggles with the fact that she sometimes hurts people unintentionally by her innocent words and decides to join the Air Self-Defence Force, hoping to maintain a certain distance from people. This decision leads her to a fateful encounter that profoundly changes her life. Hisone meets the "OTF" dragon hidden in the base, and it chooses Hisone as its pilot. When it soars into the sky with Hisone, her fate as a dragon pilot is decided. It is said that dragons have a key to the future of the world.