Jeanne Kaguya d'Arc, a girl of the Star of the West, sees visions of a Savior-King and crosses to the Star of the East with Leonardo da Vinci to find him. There she meets Oda Nobunaga, a reckless young warlord whose own people call him a fool, and becomes convinced he is the figure from her visions. The two planets, once bound by the Dragon Pulse, have been at war for generations, and reimagined historical figures fight it in giant machines called War Armor.