The Eminence in Shadow, Vol. 6 (manga)

All eyes are on the Bushin Festival as the totally enigmatic Mundane Mann advances toward the finals, winning all his matches in an instant. Just who could this mysterious knight (who is certainly not mild-mannered Cid Kagenou in disguise) possibly be. However, beneath the festivities, a dark drama unfolds as Princess Rose goes on the run following her assault on her fiancé. Was the sordid affair simply a prenuptial argument gone too far, or is something more wicked afoot.