After being betrayed and left to die in a dungeon by a supposed comrade, healer Dion stumbles upon a wounded dragon in his darkest hour. Through his last ounce of strength, Dion heals the dragon, only to discover it is the divine being Eldora. With Eldora restored, the duo embarks on a new adventure together. Meanwhile, Yuki, the leader of Dion's former party, sets out on a quest to locate him, unaware of the extraordinary bond forming between the healer and the dragon.