With the assassination of the minister's grandson, the Noble Faction launches a coup d'etat! Accepting his new role of suppressing the rebellion with his signature grin, Rou withdraws his employer, the tomboy princess, to a secret location. There, he continues training the palace guard, using Noble Faction troops as target practice! However, the Faction's two strongest warriors-the Hero of Lithic Iron and the Hero of Turbulent Waters-remain unscathed. While the Hero of Turbulent Waters is out of the city on duty, Rou and the princess take the chance to penetrate the castle...