After the Demon Lord's army attacked to world, five years ago, almost all the kingdoms had fall in his hands. In order to fight against the demons, the Church train for three years to 777 soldiers, mercenaries and people from all the world, including Sebastian Berthrod, who had lost his family by the demons' hands and now is searching for revenge. This group was named """"Heroes' Army"""" Join in this adventure of action, heroes, demons, tragedy, revenge and romance.