For 500 years, the Taboo Emperor, Arthur Gaz, controlled the Gaz Empire with an iron grip and subjected his own people to horrific experiments. But his rule came to an end five years ago, when he was beaten in a battle for the capital by a group of great warriors known as the Eight Heroes. His death brought an end to the 300-year-long conflict between the Gaz Empire and the alliance of six nations. Tooru Acura is a former saboteur from the war who is having trouble adjusting to life in the modern world because he cannot find something that allows him to use his combat talents. However, a chance presents itself when he encounters a white-haired Wizard named Chaika Trabant. She is searching with a coffin on her back.