Michikatsu constantly tried to surpass Yoriichi's talents and train himself to the point where he perfected his breathing style. However, all his efforts failed because he was inherently different ...

Kokushibo's birth name was Michikatsu Tsugikuni and the twin brother of Yoriichi Tsugikuni, deemed as the most powerful demon slayer ever. Upon awakening his demon slayer mark, Michikatsu feared ...

Yoriichi Tsugikuni, the most powerful demon slayer, had unparalleled abilities and invented Sun Breathing. Yoriichi's Demon Slayer Mark and Transparent World prowess made him unbeatable in battle ...

Muzan's near-death encounter with Yoriichi shaped his actions against demon slayers. Yoriichi's fight with Muzan laid the foundation for the victory of the next generation of demon slayers.