The Flame Breathing (炎ほのおの呼こ吸きゅう Honō no kokyū?) is one of the five main breathing styles directly derived from Sun Breathing.

Description
Flame Breath is a style of breathing that mimics flames and replicates them with the user’s movements, techniques, and abilities. Most, if not all, known techniques and forms involve extremely powerful single strikes initiated from a high position. Flame Breath users also visualize themselves creating and manipulating fire when triggering its techniques.
This breathing style was created from one of Yoriichi Tsugikuni’s students who attempted to learn Sun Breathing, but since he wasn’t as powerful as Yoriichi, he was taught an alternate breathing style. personalized that focused on his individual strengths and weaknesses, which eventually evolved into flame breathing.

Known users
- Shinjuro Rengoku
- Kyojuro Rengoku
- Mitsuri Kanroji

Known techniques
The Flame Breathing has 9 techniques in total, with six known forms and an esoteric art, the Ninth Form: Rengoku being exclusive to the Rengoku family.
- First Form: Unknown Fire (壱いちノ型かた 不知火しらぬい Ichi no kata: Shiranui?) – The user charges their opponent at high speed and decapitates them with a single blow from behind.
- Second Form: Rising Scorching Sun (弐にノ型かた 昇のぼり炎えん天てん Ni no kata: Nobori En Ten?) – The user launches an upward arcing attack.
- Third Form: Flaming Universe (参さんノ型かた 氣き炎えん万ばん象しょう San no kata: Kien Banshō?) – The user swings their blade in an arc downward.
- Fourth Form: Flower Flame Ripple (肆しノ型かた 盛せい炎えんのうねり Shi no kata: Sei En no Uneri?) – The user swings their blade in a circular motion that can defend them from all attacks incoming or decapitate multiple enemies at once.
- Fifth Form: Flame Tiger (伍ごノ型かた 炎えん虎こ Go no kata: Enko?) – The user performs a series of powerful sword swings that appear to take the form of a flame tiger.
- Ninth Form: Rengoku (玖くノ型かた 煉れん獄ごく Ku no kata: Rengoku?) – A devastating saber slash that the user launches from a high position, this technique is powerful enough to leave a deep burning imprint the ground where it is thrown.

