The story of "Yggdra Union" starts with the Princess of Fantasinia, Yggdra, fleeing her besieged home with the family heirloom, the Holy Sword Gran Centurio. Throughout the story, the idea that justice lies with the Holy Sword is used to drive Yggdra and her army forward through their plight, as well as to provide explanation to them for the acts they commit. It is constantly used as justification for their acts, particularly those situations in which civilians are slaughtered during the war.