At some point after age 7, kokushibo awakened his use of the transparent world. Webkokushibo is one of the most dangerous demons, second only to muzan kibutsuji. He wields a katana made out of his flesh and blood, utilizing his mastery of. Kokushibo has the upper hand on this ability since he can also create his. Webkokushibo was a human during the sengoku era, and was the older brother of yoriichi tsugikuni. As a human, he was a powerful swordsman and respected. Drilling slashes, moon through bamboo leaves on an injured sanemi. Webthen, himejima and sanemi manage to rip kokushibo's haori (coat) off, and that's where kokushibo stops playing around. Himejima and sanemi went from trying to go on the.