Koriyuki never knew her parents, but she always wanted to know who they were. A volcanic night fury couple, Ash and Coal, took her in. She also knew it was hard for them, living in a taiga and not on a warm volcanic island. When she grew old enough, Ash and Coal sent her to find out about her past. She went through a wormhole, now she's in the kingdoms of N'yrthgar. Koriyuki learns that she must find Argentavis and N'yrtha, or risk never finding her true self.