Ninomiya Kinji has finally returned to the modern world, but while he was gone, a mysterious and beautiful young girl has made her mark on the Raiza'ha mining corporation. She calls herself Himeno Mikoto, but just who is she really...? The sudden appearance of Kinji's younger sister plunges the world of Amuria into chaos! Don't miss the beginning of the final arc of The Dungeon of Black Company, where every secret will be revealed!