Kōza Kubisaki

Kōza wore basic samurai armour including a tall helmet and a sword sheathed at the waist. He had grey-brown hair and a moustache. He also had light grey-coloured eyes.

50 years prior to the start of the series, Kōza and his army were surrounded by an enemy army, where a majority of his soldiers were killed mercilessly. As only a few remained Kōza grudgingly admitted he would die by nightfall, but summoned Shiromari as a last resort, with the intent of wiping out his enemies in the process. However, Kōza died before he could undo the summon, thus leaving Shiromari to take the form of the destroyed castle and devouring any passerby who approaches.