Yahiro Narusawa once lived alone in the ruins of Tokyo, but things have changed for him in the blink of an eye. Now his job is to protect a dragon medium a girl named Iroha who wields the power of fire and the ability to summon a dragon. Yahiro s sister, Sui, is also a dragon medium and responsible for the cataclysm that destroyed Japan. He s been searching for her all this time, and he s finally discovered that she s allied with the shadowy organization Ganzheit. Determined to kill Sui for what she s done, Yahiro agrees to work with arms dealer Galerie Berith to eliminate both her and the dragons. That said, Yahiro won t have any trouble finding them, because the dragon mediums and their Lazaruses are coming for him!