In their pursuit of creating a perilous weapon, the Garubado Empire had put in considerable effort. However, the weapon was stolen and disappeared during a destructive battle. In an attempt to retrieve it, the Empire is now in search of a young woman with unique powers that can summon the "Dragoon" energy. The girl, unfortunately, has amnesia and fate leads her to cross paths with a skilled swordsman, who travels aimlessly while perfecting his abilities. He promises to aid her in uncovering her true identity and the source of her extraordinary capabilities.