Webkokushibo is a demon and the upper moon one in the anime series kimetsu no yaiba (demon slayer).
He was a human breath user and a demon slayer who joined muzan.
Webmuzan summons the remaining 5 upper moons to a similar meeting as he did with the lower moons after rui was killed.
Same location and everything, except he doesn't.
Webusers share their opinions and arguments on how strong kokushibo, the upper moon 1, is compared to muzan, the demon king, in the manga kimetsu no yaiba.