Flame Hashira Chronicles

The Flame Hashira Chronicles gathers the notes of many Flame Hashira across history. Its earliest entries originate in the Sengoku era, set down by a Rengoku forebear who first wielded Flame Breathing. The records survived intact down to the Taisho era.

The book traces Flame Breathing back to Sun Breathing, the original style from which every other derives. It frames all later styles as inferior imitations and notes that Sun Breathing practitioners traditionally wear Hanafuda earrings. It also preserves an account of the clash between Yoriichi Tsugikuni and Muzan Kibutsuji, which Yoriichi himself described to the first Flame Breathing user, including mention of the thirteenth form of Sun Breathing.

The Chronicles serves as a generational archive, carrying technique knowledge and historical accounts forward through the Rengoku line. The most recent volume, titled the record of the twenty-first generation Flame Hashira, belonged to Shinjuro Rengoku. Crushed by feelings of inadequacy after learning his style was a derivative of Sun Breathing, he tore the book apart in anger before stepping down as Hashira.

Its lasting value lay in a detail Senjuro Rengoku rediscovered: the ancestor's note about the thirteenth form. After his elder brother Kyojuro fell, Senjuro sent that information to Tanjiro by crow. Reading it, and later reliving an inherited memory of Sumiyoshi Kamado, Tanjiro grasped that the thirteenth form could be reached by endlessly cycling the twelve forms he had mastered.

The Rengoku family preserved and read the Chronicles across generations, with Shinjuro Rengoku holding the latest edition before destroying it. Kyojuro Rengoku pointed Tanjiro Kamado toward the family estate where the notes were kept, and Senjuro Rengoku ultimately located the key passage and relayed it. The book debuts in Chapter 66 of the manga and Episode 34 of the anime.