Against the vast and awesome Empire stands the Union, and alliance of a nation great and small. The Union protects the goddess, and for years the two rivals matched each other in strength and power. For now the Empire has gathered demons and monsters to its cause and its military has grown beyond reckoning.

Thus stand a young man. “Caim” who was once a former prince and has of a small kingdom that was destroy by dragons in service of the empire, Caim also make a pact with a strong and fearful pact beast, the Red Dragon. It was only later to find out that his childhood friend Inuart has join the Empire and make a pact with the black dragon who kill Caim parents.