The author of the series loves to fold these subtle but important details into the simplest things. Fans may not have noticed much, but why did Tanjiro get a black sword? It’s strange that the Nichirin blade changes color as soon as its owner, which is Tanjiro, draws it. Here’s all you need to know to unlock all the secrets!
Nichirin blades change their color to their owner. It also reflects the personality of the sword wielder. Is Tanjirou special? Well, he’s the main character so it’s reasonable to conclude that. However, just how special is he that turns the sword black when unsheathed? Read on to find out!

Where it all begins!
Hundreds of years ago, there was a man named Yoriichi. He is the creator of breathing patterns. And the one who left scars on Muzan’s immortal body, nearly killing him with a single blow. On the verge of death, the weak Muzan hid for a hundred years until the swordsman passed away. But Muzan never forgot the sword that nearly killed him, a night-black sword that glittered like the sun from Yoriichi’s breath of the sun.
Fearing for his life, Muzan ordered the execution of every swordsman who had learned the sun-breathing style. The user of the black Nichirin sword has the potential to learn how to breathe with solar energy. This is Muzan’s greatest weakness, as the black sword has the ability to deal damage that demons cannot heal and regenerate.

Tanjiro opens the black Nichirin case
After Tanjiro made his final selection, the Demon Slayer’s swordsmith asked him to choose a sword. With the Nichirin sword, he will officially become a Demon Hunter and join the police investigation team. Blades have different colors for different masters. For example, Rengoku has red Nichirin. It corresponds to his fire-breathing style which is flame hashira. On the other hand, Giyu Tomioka has a blue sword because he uses the water breathing style. But unlike Giyu, Tanjiro has a black sword.
Didn’t Tanjiro also practice the water-breathing style chapter? According to the blacksmith Haganezuka, it was a sign of a bad omen. He was extremely angry when he saw the blade turn black. It is said that anyone who wields a black sword has a short life. This can be explained through the entangled fate of the sun and demonic breath users. Muzan killed each of the sun breath users before they reached their full potential. But why is black Nichirin associated with the sun-breathing style? Read on to unfold!

Why Tanjiro Got the Black Sword: Breathe Style of the Sun & Hinokami Kagura
The black blade represents the breath of the sun. The story then reveals that Tanjiro’s sword is actually not black but red in disguise. Black has the ability to absorb heat of any spectrum. When the temperature is high enough, the sword turns red, possibly representing the sun. Sun Breathing is the source of all other styles. Thus, metaphorically, the black sword represents the supreme breathing style that absorbs all other techniques into one.
The bearer of the Black Blade has the ability to have multiple breathing patterns as he can achieve something stronger than all of them. This also explains why Tanjiro obtained a black sword. It was because he knew Hinokami Kagura was different from the water-breathing style. To uncover more such mysteries, stay tuned to OtakuGO!
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