In a series about ancient demons lurking in the shadows and powerful swordsmen trained to stop them, it's surprising that one of Demon Slayer: Kimetsu no Yaiba's biggest mysteries is the color of Tanjiro Kamado's sword. The Nichirin blade is a Demon Slayer's best friend, as it is one of the only ways that a demon can be killed. The swords also carry a personal touch because the metal of a Nichirin blade will change into one of several colors depending on the wielder. When Tanjiro's sword unexpectedly turned black, it may have been the first sign that he was in for a remarkable journey. Nichirin blades are capable of killing demons via decapitation because the mountain where the metal is mined is constantly drenched in sunlight, the fatal weakness of all demons. Decapitation by any other means will not kill a demon, making the swords vital to the Demon Slayer Corps. Once Tanjiro survived the Final Selection, the Corps' Swordsmith, Hotaru Haganezuka, delivers Tanjiro his personal Nichirin blade to officially make the young Kamado a member of the Demon Slayer Corps. When Haganezuka sees Tanjiro's reddish hair, he becomes hopeful that he will get to see a bright red Nichirin sword. However, once Tanjiro unsheathes his weapon, the blade turns a dark black, to the concern of Urokodaki and the anger of Haganezuka.
39;s incredible will, or it could be a sign that he is destined for greatness.
Noting their reactions, Tanjiro worries that the color is an omen of bad luck, which Urokodaki answers isn't necessarily the case. That Tanjiro travels with his sister who is a demon who doesn't eat humans is already strange among demon slayers. But, he becomes even more anomaly as Urokodaki mentions that black swords are rare. The unusual color is still an indication of Tanjiro's talent though because Nichirin blades do not change color for a wielder who is unskilled with a sword. Tanjiro pushed himself beyond his body's limits for two years while training to become a Demon Slayer, as he is not naturally gifted. The black color may be a testament to Tanjiro's incredible will, or it could be a sign that he is destined for greatness. Despite the significant personal meaning behind the color of Nichirin blades, they all are capable of killing demons so at least Tanjiro is not disadvantaged due to his sword's unusual shade. When Tanjiro boards the Mugen Train to join Kyojuro Rengoku for a mission, the Flame Hashira offers to train him himself, asking Tanjiro the color of his sword.
Perhaps ominously, Kyojuro bursts out laughing upon hearing that it's black, describing the color as unfortunate. Kyojuro has never heard of a Demon Slayer with a black sword becoming a Hashira, citing that they tend to struggle to decide on a Breathing Style to master. Kyojuro's explanation regarding the color of Tanjiro's sword does make a certain amount of sense, considering that Tanjiro, too, has found himself caught between multiple Breathing Styles. Initially, a user of Water-Breathing, Tanjiro has come to rely on the Hinokami Kagura, later revealed to be a Sun-Breathing technique. Tanjiro currently holds the distinction of being the only Demon Slayer in the series with a black sword and the only one who uses multiple Breathing Styles. Still, the Flame Hashira's words aren't overly helpful regarding why Tanjiro's sword is so unusual. It's possible that black swords are so rare because the users often die young, weakened by their lack of mastery of a single Breathing Style. By all rights, Tanjiro should be dead several times over by now, considering his knack for being in constant danger even more so than the average Demon Slayer. He is constantly attacked by members of the Twelve Kizuki, the most powerful demons in the world, and it's a miracle that Tanjiro has survived all that he has. He's even the first Demon Slayer to have an encounter with Muzan Kibutsuji, the Original Demon, and live. Tanjiro has always had a touch of destiny about him, so his unusual sword and knowledge of Sun-Breathing, the original and most powerful Breathing Style, may be signs that he is destined for greatness. It may just be that Tanjiro's black sword is nothing more than a way to show that he is unique, but only time will tell if any further meaning will be discovered about his sword. After all, Ubuyashiki, leader of the Demon Slayer Corps, says that Muzan's encounter with Tanjiro is the first time he's ever shown himself to a Demon Slayer, meaning that the tide is finally turning and Tanjiro just might be the reason why.
Moon Breathing (月 (つき) (こ) (きゅう), Tsuki no koky? ) 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.
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.
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.
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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.
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.