Ragna is a talentless dragon hunter who rides with the prodigy Leonica in a world where dragons rule the skies and seem drawn to him, slaughtering everyone close to him. A vision of Leonica's death puts him face to face with his own future self, who hands him overwhelming power and the memory of what is coming. To change that future Ragna must also win over a cold, ruthless figure known only as Crimson, and together they set out to exterminate dragonkind.