Drakengard follows the story of a kingdomless prince named Caim who fights for the Union against the Empire. Under the Union's protection are the Hierarchs and the Goddess, currently Caim's sister Furiae, who is a human manifestation of one of the four seals that protect the world from being broken. As the game begins, Cain is fatally wounded in a battle with the Empire. Encountering a captured Red Dragon who is also near death, Caim makes a fateful choice. In exchange for both their lives, the Red Dragon and Caim will enter a pact. This pact will forever chain their lives to one another and link their souls, at the cost of something irreplaceable. Recharged with the fires of a Dragon, Caim's vengeance burns over the enemy...