In the expansive Garubado Empire, a powerful weapon capable of immense destruction goes missing during its creation and is lost in the chaos of war. The Empire's pursuit focuses on a young girl possessing the ability to summon the formidable 'Dragoon' force. Suffering from amnesia, she crosses paths with a traveling apprentice swordsman who pledges to aid her in unraveling the mysteries of her identity and the origins of her extraordinary gift.