Moon Breathing (月 (つき) (こ) (きゅう), Tsuki no kokyū?) is a Breathing Style derived from the Sun Breathing used by Upper Rank One, Kokushibō, who was one of the first Demon Slayers who utilized breathing techniques. The techique allows the user to create many "chaotic blades" when slashing that varies in length and size. It is known that Kokushibō continued to develop and add techniques to the Breathing Style over the centuries as an immortal Demon. At this point in the story, it is the only known Breathing Style to possess at least 20 different techniques, easily surpassing the other Breathing Styles. It has been revealed that, like all of the other original breathing styles, the Moon Breathing also branched out of the Sun Breathing. When its creator, Michikatsu Tsugikuni, attempted to learn the Sun Breathing from his twin brother, Yoriichi Tsugikuni, he discovered he was unable to master the breathing style and so was instead trained in an alternate Breathing Style. Yoriichi created it fit and cover his individual strengths and weaknesses, and Michikatsu then continued to train and develop this breathing until it eventually evolved into its own unique Breathing Style, which he named the Moon Breathing.
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First Form: Dark Moon, Evening Palace (壹 (いち) (かた) (やみ) (づき) (よい) (みや), Ichi no kata: Yamidzuki - Yoi no Miya?) - Kokushibō draws his sword and slashes swiftly in a single motion; like with all Moon Breathing techniques, numerous chaotic blades originate from the slash. This technique resembles Iaijutsu. Second Form: Pearl Flower Moongazing (貳 (に) (かた) (しゅ) (か) (ろう) (げつ), Ni no kata: Shuka no Rōgetsu?) - Kokushibō performs several slashes while sending a barrage of chaotic blades forward. Third Form: Loathsome Moon, Chains (參 (さん) (かた) (えん) (き) (づき) (つが), San no kata: Enkizuki - Tsugari?) - Kokushibō swings his sword rapidly in two gigantic crescents slashes, from which a storm of smaller crescents spread.
This technique causes huge destruction in a small area. Fourth Form: Solar Rings, Frostmoon (肆 (し) (かた) (たい) (よう) (りん) (しも) (づき), Shi no kata: Taiyōrin - Shimodzuki?) - Kokushibō performs a circular small cyclone slashes of chaotic blades straight towards his opponent. Fourth Form: Improved, Red Sun over Paradise (肆 (し) (かた) (かい) (あっき) (よう) (らく) (えん), Shi no kata kai: Akk' yō Rakuen?) - Kokushibō spins his blade slicing through the ground and ripping it out. Causing multiple 180 slashes across the area to be sented towards his opponents as chaotic blades appear when near the enemy slicing into their body. As the circular slashes spin grinding into the enemys skin.
Kokushibō performed this attack without swinging his blade.
Fifth Form: Moon Spirit Calamitous Eddy (伍 (ご) (かた) (げっ) (ぱく) (さい) (か), Go no kata: Geppaku Saika?) - Kokushibō makes multiple curved slashes layered over one another, resembling a rising vortex. Numerous chaotic blades originate from these slashes. Kokushibō performed this attack without swinging his blade. Sixth Form: Perpetual Night, Lonely Moon - Incessant (陸 (ろく) (かた) (とこ) (よ) (こ) (げつ) (む) (けん), Roku no kata: Tokoyo Kogetsu - Muken?) - Kokushib releases a wild storm of slashes in multiple directions. This technique was powerful enough to not only slice up multiple Hashira around him but also overwhelm the Wind Hashira Sanemi Shinazugawa.
Seventh Form: Mirror of Misfortune, Moonlit (漆 (しち) (かた) (やっ) (きょう) (づき) (ば), Shichi no kata: Yakkyō - Dzukibae?) - Kokushibō swings his sword in a powerful frontal slash that then creates a multi directional frontal assault, powerful enough to create several deep gouges in the ground and push back two Hashira. Eighth Form: Moon-Dragon Ringtail (捌 (はち) (かた) (げつ) (りゆう) (りん) (び), Hachi no kata: Getsuryū Rinbi?) - Kokushibō triples the range of his normal attack radius and creates a singular gigantic slash that slowly decreases in size.
Ninth Form: Waning Moonswaths (玖 (く) (かた) (くだ) (づき) (れん) (めん), Ku no kata: Kudaridzuki - Renmen?) - Kokushibō creates a seemingly endless stream of claw-like vertical and horizontal slashes, capable of cutting down his intended target from a long range. Tenth Form: Drilling Slashes, Moon Through Bamboo Leaves (拾 (じゅう) (かた) (せん) (めん) (ざん) (ら) (げつ), Jū no kata: Senmenzan - Ragetsu?) - Kokushibō creates a triple-layered slash twister, capable of mowing down his targets into three clean pieces.
Sending large crescent spinning blades around him t burst out of the ground and shatter.
Eleventh Form: Cosmic Infernadoes (拾 (じゅう) (いち) (かた) (えん) (だい) (しょう) (たつ) (まき), Jū Ichi no kata: Endai Shōtatsumaki?) - Kokushibō twirls his blade to create multiple chaotic structures of pure slashes that bear striking resemblance to actual tornadoes/cyclones that slowly chase down their foes. In addition to that, the chaotic blades emanating from the slashes act much like debris from the respective disaster. Twelfth Form: Waxing Moonstones (拾 (じゅう) (に) (かた) (のぼ) (づき) (げっ) (ちょう) (せき), Jū Ni no kata: Noborudzuki Gecchaseki? ) - Kokushibō Backflips into the air. He twirls his blade turning his grip into a reverse grip before swinging his reverse blade down onto the ground. Sending large crescent spinning blades around him t burst out of the ground and shatter. Sending it towards his opponents.
Thirteenth Form: Midnight Anarchy, Animosity (拾 (じゅう) (さん) (かた) (ま) (よ) (なか) (むちつ) (じょう) (てき) (い), Jū San no kata: Mayonaka Muchitsujō - Teki'i?) - Kokushibō launches and slices in a singular motion causing 4 slashes to appear these 4 slashes appear withhin the enemys shoulders and knees.