This is a story about struggle. The background of the story is similar to that of the European medieval world. Countries fight against each other and raise large armies. The lives of ordinary people are poor and mercenaries have become a fashionable industry. In this world of flames, there are not only human wars, but also monsters called "Apostles". These apostles were originally human beings. Because of certain stimuli (such as the betrayal of beloved ones), they sacrificed their most cherished people to the "Hand of God" through a tool called Behlet, and turned into monsters beyond the reach of ordinary people. And at the beginning of the story, a man named Gus, carrying a one-man-tall sword, looked for and hunted the apostles everywhere, even if he was covered with scars. The reason behind it is a fascinating golden age.