Webthere are so many wonderful, heartbreaking stories and character arcs that are so fun to analyze and dig into. Theirs is one i keep coming back to. What a great way to tell their. Webkokushibo in demon slayer explained. 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. Webremembering yoriichi's words that a generation will surpass their own already powerful era of demon slayers, kokushibo became scornful of the hashiras fighting. Webgyomei offensively used the transparent world to counter kokushibo's actions. He swung projectiles guided by the transparent world, damaging kokushibo.