Plot

Köinzell, a young swordsman wielding the deadly black sword, faces rumors of bloodshed. Pursued by the Traitorous Lances, he battles to uncover the truth behind his quest amidst enemies' corpses.

Rumors stir throughout the land: when the wielder of the black sword draws his dark blade, all who stand in its path are torn asunder.... Köinzell, the mysterious young boy who carries the black sword, undeniably wields it with exceptional skill, but can he truly be responsible for the bloody rumors? Pursued by the Traitorous Lances, four powerful warriors who were thought to have been defeated by the Seven Heroes, the strength of the young swordsman will be tested to its limit. At battle's end, only the shocking truth of Köinzell's quest will stand above the corpses of his enemies... An epic fantasy on the grandest of scales.—Pony Canyon

Fourteen warriors set out to prevent an invasion, but only seven return. Three died along the way, and four were slain for betraying the empire. In truth, it is the Seven Heroes who turned on their allies so they could take all the glory. Ascheriit was their victim, but now, 20 years later, he is back to get revenge.—Amazon Prime Video