Hisone is a rookie pilot at Gifu base of Japan Air Self-Defense Force (JASDF). She is a very honest person who can never lie, and this leads her to hurt people unconsciously. Early in her career she encountered a dragon, Masotan, and was swallowed by him. This is how he chose Hiosone as his pilot. She gradually gets a thrill to fly with Masotan, and decides to live her life with the legendary dragon.