Nina, a princess from the Wyndian clan, accompanied by her guardian Cray, is on a relentless quest to find her missing elder sister Elina. While en route to Elina's last known location, fate intervenes, and they meet with an accident. Nina sets out alone to seek help in a nearby town where she encounters Ryu, a young man suffering from amnesia. Their meeting catalyzes a chain of events that embroil them with The Endless, the divine race of immortal dragons that possess the ability to mold the world as they desire.