At her coming-of-age ceremony, Princess Julia of Audria must pick a guardian knight. In her earlier life she rescued a boy named Leo, trained him, and chose him, only for him and her sister Chloe to betray and kill her. Reborn on the day of the ceremony, Julia turns her back on Leo and selects Kane, the knights' scorned Grey Mouse, a man who looks clumsy, idle and average with a blade.
Behind that mask Kane is the secret Shield of the Kingdom, the final dragon slayer still living. As Julia grows close to the man everyone looks down on, the plots of Leo and Chloe start to surface, and Julia must decide how far she will go to defend the realm she now rules.
