Flame Breathing (炎ほのおの呼こ吸きゅう Honō no kokyū?): A Breathing Style taught to Kyojuro by the previous Flame Hashira, Shinjuro Rengoku, and later mastered by reading the instruction books left behind by previous Flame Hashira in the Rengoku Family. As the Flame Hashira, Kyojuro is his generation's most skilled Flame Breathing user. He became evidently proficient in fighting with this Breathing Style.

Techniques

First Form: Unknowing Fire (壱いちノ型かた　不知火しらぬい Ichi no kata: Shiranui).
- The user charges towards their target at high speeds and unleashes a singular slash that aims to decapitate them.

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 releases an arching sword slash upwards.

Third Form: Blazing 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 downwards in an arc.

Fourth Form: Blooming Flame Undulation (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 is used to defend from incoming attacks or slash multiple targets in one swoop.

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 slashes that seemingly takes the form of a flaming tiger.

Ninth Form: Rengoku (玖くノ型かた　煉れん獄ごく Ku no kata: Rengoku?, lit. Ninth Form: Purgatory).
- The most powerful Flame Breathing technique. The user takes a high stance with their sword before dashing forward at high speeds. The technique is powerful enough to completely carve out the ground in its wake. This technique seemingly took the form of a flaming Japanese dragon that envelopes the user as they are charging towards the target.