An era dominated by the Eisen Empire, which eradicated a world of swords and magic using guns and cannons. While the Empire's high-handed actions draw the public's resentment, three thieves stand up against them: the leader Claude, the knight Murakumo, and the mage Yuri. As fellow outlaws targeted by the Empire, they live joyfully and plan to plunder the Empire's treasures again today—or so they thought, until they accidentally kidnap Emma, the princess of a ruined kingdom!? Three men, one girl, and one animal will turn the world upside down in this exhilarating fantasy!