Demon Slayer: Why Did Tanjiro's Nichirin Sword Turn Unusually Black?
Demon Slayer has been on the air for a long time, but its popularity has not declined for a long time. Although the plot of the anime has developed after Tanjiro beheaded the demon king Muzan Kibutsuji, many of the early plot "pits" have not been buried. The colour of the protagonist Tanjiro's katana, the nichirin sword, is an unexplained point.
1. Nichirin sword is made of materials with solar energy
The nichirin sword, also known as the colour-changing sword, changes colour according to the user's breathing. However, Tanjiro's nichirin sword did not turn into the blue adapted to the water breathing or the red expected by the swordsmith but turned black. It can be seen from the attitude of the master Urokodaki Sakonji and the swordsmith that black katana are very rare, but there is no reason for them to become black. And we can speculate based on the protagonist's breathing method and family origin, why Tanjiro's anime katana sword turns black.
2. The reason why Tanjiro's nichirin sword turns black
First of all, what Tanjirou first mastered was the sun breathing, and the sun breathing was the origin of all breathing methods, and other breathing methods were derived from the initial breathing. Black seems to be the most monotonous colour, but in fact, black contains all colours, and there are very few swordsmen in Breath of the Sun, so black blades are particularly rare. And the earliest swordsman of the sun breathing, that is, the founder of the breathing method, Tsugikuni Yoriichi. His anime katana sword is based on black with red. Kagura, the Hinokami Kagura mastered by Tanjiro, caused the nichirin sword to turn black, but he was a pure black that was hard to see.
Tanjiro's master is the predecessor Tomioka Giyuu, and he mastered the water breathing method, so the breathing method taught to him is also the water breathing method. Few people master the two breathing methods, and Tanjiro is one of them. There is a possibility that a swordsman who masters two breathing methods will turn the nichirin sword black, but there are very few swordsmen who master two breathing methods originally, and if they master two breathing methods, naturally they are not proficient in both, so In the history of demon slayers, they are all mediocre, and there is no record.
In the later period, the setting of red sword appeared. The reason why Nichirin Sword can kill demon is because of the energy of the sun. Theoretically, no matter what breathing style, if certain conditions are met, it can turn red by heating up, which is the red sword mode.
In fact, from the name of the protagonist, perhaps the setting of the black katana is like charcoal. There is a huge amount of energy at first, but it doesn't burst out, and when the temperature rises, it burns up, and the sunlight energy bursts, it changes from black to red.
Another possibility is that when Urokodaki Sakonji met Tanjiro for the first time, he found that Tanjiro was very gentle and difficult to make a decision. The breathing method is related to his characteristics, and these characteristics are likely to include personality. Tanjirou also has goodwill and an understanding of demon, and perhaps the pure black sword also represents his tolerance and understanding of all life. Tanjiro's black anime katana sword is the embodiment of his uniqueness, not only because of the inheritance of the sun breathing, Perhaps Tanjirou can communicate with all things because he is a special existence.