 The plot develops around a mercenary named Emerald "Deadeye" Flint, who takes up a seemingly simple task to escort a cargo ship, transporting the nearly worthless delivery of sulfur, through quiet waters.Shortly after the beginning of the voyage, the protagonist becomes the sole hostage after an anarchistic group of Shogunate mercenaries raid the convoy.However, he is released by their leader, Hóng Lóng, who is a well-known arch-enemy of, and has formed a love–hate relationship with the protagonist after helping him escape prison.