What makes Demon Slayer so exciting are its intense and emotional life-or-death battles between the Hashira of the Slayer Corps and Muzan's demons. Muzan's Upper Rank demons are so powerful that it often takes multiple Slayers to bring just one of them down, and even then the Slayers still aren't always successful. Such overwhelming power is the rule as far as demons go, but there was one man in history whose name struck fear in even the most powerful of demons, and that man was Yoriichi Tsugikuni.

Yoriichi has become a legendary presence in the world of Demon Slayer for at least two reasons. For one, he is the originator of the breathing techniques that are used to slay the demons of Tanjiro's era. Without his influence, humanity would likely have no means to fight back against Muzan's demonic spawns. The second (and perhaps most important) reason Yoriichi is remembered...