Hisone is a rookie pilot at Gifu base of Japan Air SelfDefense 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.