In a world where humanity lives among the clouds, society exists on a continent of floating islands. But where mankind once reached every corner of the earth, all are now hemmed in by the threat of the vicious dragonfish, with only the Protectors to keep them safe. But Asebi and Yuu, a Protector, brave these dangerous skies on a search for the legacy of man's golden age: the Woldesia Era. At the end of their quest lies Asebi's destiny and, possibly, the key to a new grand era for humanity.