Breath of the Sun

The Breath of the Sun (の) is an as-of-yet-unseen style of swordsmanship. It was utilized by the first Demon Slayer to use breaths, Yoriichi Tsugikuni, and serves as the basis for other Breath Styles derived from it as a result of Yoriichi changing the breathing techniques to suit the individuals he taught. The derived styles eventually branched out into the main breaths: Breath of Water, Breath of Flames, Breath of Wind, Breath of Thunder, Breath of Stone, Dance of the Fire God, and Breath of the Moon. Before Kokushibo died, he mentions that all users of the Breath of the Sun were killed by him and Muzan Kibutsuji, before proceeding to question why the Dance of the Fire God exists due to its presumed similarities to the Breath of the Sun's techniques.

Trivia

 * The kanji,, for "Sun", has the same pronunciation as the kanji , which means "Fire".