The Holy Grail of Eris, Vol. 11 (manga)

It began as two simple questions—Why was Scarlett Castiel executed ten years ago? And who was the culprit behind it all? But the answers hide themselves behind layers of mystery, from the unusual blood flowing in Scarlett’s veins, to the plots of a traitorous noble, to the fate of a country poised on the brink of war. At last, Randolph Ulster approaches the truth, gripped in the hands of two men with too much to protect: King Ernst Adelbide and his lifelong friend at the heart of the conspiracy—Duke Castiel, Scarlett’s father himself.