First introduced through the Hinokami Kagura that was passed down through generations of the Kamado family, Sun Breathing is the source of all other Breathing Styles in Koyoharu Gotouge's Demon Slayer: Kimetsu no Yaiba. Invented by Yoriichi Tsugikuni, this Breathing Style played a huge role in his near-defeat of the Demon King, Muzan Kibutsuji.