Webkokushibo and tanjiro are not related by blood. They belong to different families and have no direct ancestors in common. However, they are connected by fate.

At the age of 25, kokushibo found himself afflicted with. Webkokushibo's decision to transform into a demon was motivated by envy and jealousy towards his brothe­r. He wanted to surpass his brother's abilitie­s at all costs. Webaccording to supplementary material, after his brother had died, kokushibo discovered the residence of the ubuyashiki family and killed the leader of the demon slayer corps at. Webit was in his moment of death that kokushibo realized that his desire for strength, his jealousy of his brother, and his fear of dying, led him to make the mistakes. Webthe shocking truth is that muichiro tokito is the descendant of kokushibo, who was originally named michikatsu tsugikuni. And kokushibo was the older twin.

Webit was in his moment of death that kokushibo realized that his desire for strength, his jealousy of his brother, and his fear of dying, led him to make the mistakes. Webthe shocking truth is that muichiro tokito is the descendant of kokushibo, who was originally named michikatsu tsugikuni. And kokushibo was the older twin. Webwhy did kokushibo become a demon? Kokushibo became frustrated with his inability to surpass his brother, yoriichi tsugikuni, who possessed natural talent and abilities as a. Webas a human, he was a powerful swordsman and respected member of the demon slayers corps. However, he was never able to step out of the shadow of his.

Webas a human, he was a powerful swordsman and respected member of the demon slayers corps. However, he was never able to step out of the shadow of his.