Webkokushibo is one of the major antagonists of demon slayer. Before he became a demon, he was actually a human named michikatsu tsugikuni, who. Webkokushibo in demon slayer explained. Webupper moon one kokushibo maintains the highest rank among the 12 kazuki, so it is apparent that he is the most powerful among all the other demons. Webthe demon king revealed the death of gyutaro, berating kokushibo and his fellow upper ranks for their weakening demon strength and citing their failures as being unable to. Webthe kokushibo sword exists in the world of demon slayer, where the boundary between magnificent beauty and horrible terror becomes blurred.
