Centuries before Tanjiro, Yoriichi Tsugikuni, the original Sun Breathing user, nearly defeated Muzan Kibutsuji. Muzan, the first demon, was forced to shatter himself into pieces to escape Yoriichi ...

While Tanjiro inherited Yoriichi’s Sun Breathing, he never reached the same level of mastery. The power ceiling of Demon Slayer had already been established centuries before the main story began ...