Demon Slayer

Why Tsugikuni Yoriichi is the strongest explained![Demon Slayer]



Please note that the article contains spoilers.

Demon Slayer (Kimetsu no Yaiba) is very popular all over the world. The manga's antagonist, Muzan Kibutsuji, is one of the strongest characters in the history of the manga because his regeneration begins the moment when his body is severed. He is far stronger than Piccolo from Dragon Ball.

Actually, there is a stronger character that far exceeds the power of Muzan Kibutsuji.



He was the swordsman known as Yoriichi Tsugikuni.

Although He was not a demon, he was the strongest swordsman, easily surpassing anyone.

This article thoroughly explains the identity, abilities, and strength of his. Why he is the strongest swordsman in the world? Here is a summary of Yoriichi Tsugikuni's past and history.

You will find out the following.

  • Yoriichi Tsugikuni's inventions
  • Yoriichi Tsugikuni's life and death
  • Strength comparison of Yoriichi Tsugikuni and Kibutsuji Muzan

Yoriichi Tsugikuni is the founder of the Breathing of the Sun

First of all, let's look into the true identity of Yoriichi Tsugikuni.


His swordsmanship was so beautiful that one forgets to take a breath. Kamado Tanjiro once said, "The Breathing of Sun Dance is beautiful".


The dance was developed by Yoriichi Tsugukuni and has been passed down from generation to generation in the Kamado family for hundreds of years as the "Hinokami Kagura" dance.

The "Breathing of the sun" is the origin of all "basic breathing". In the past, the pillars of the Demon Slayer Corps were strong, but they had few blade techniques such as fire and wind. Therefore, one after another, Yoriichi Tsugikuni developed breathing techniques and tailored to their respective swordsmanship.

Therefore, the breathing of the sun is known as the "breath of the beginning".

Just before the battle with the Upper Rank 4 of The Twelve Kizuki, a battle doll called "Yoriichi Type Zero" was introduced. This battle doll was modeled after the Yoriichi Tsugikuni. More to the point, the "mysterious swordsman" that has been appearing since the beginning of the story is Yoriichi Tsugikuni. It is indeed Yoriichi Tsugikuni who taught and guided Demon Slayer Corps.

However, no matter how gently and carefully Yoriichi Tsugikuni taught them, no one has ever been able to master the breath of the sun since him.

He was a natural-born swordsmanship prodigy.

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Yoriichi Tsugikuni was the strongest from his birth to death

Yoriichi Tsugikuni was born as a younger twin brother in a samurai family, and for some reason, he already had a birthmark from when he was a baby.

When a mark appears, it increases one's physical abilities.

It's clear that he had extremely outstanding physical abilities since he was a child.

In fact, when he was only seven years old, he had acquired the ability to see through living beings' bodies. He took care of his ill mother and supported her throughout his childhood.

When he was seven years old, Yoriichi Tsugikuni easily overwhelmed adult swordsmen. No swordsman could defeat the young Yoriichi Tsugikuni. That's how big the effect of the mark was. The marked person would die by the age of 25. Since his physical abilities were far more powerful, the burden on his body was also great.


However, despite having the mark, Yoriichi Tsugikuni did not die early.

Yoriichi didn't die until he was 80 years old, though having the mark

As we will see later, his older brother Michikatsu Tsugikuni became jealous of his younger brother, Yoriichi's talent.

So Michikatsu Tsugikuni became a demon, Kokushibo, who was by far the strongest of the six Upper Ranks' demons.

Until he was in his twenties, his brother Michikatsu fought together with Yoriichi to destroy demons as a member of the Demon Slayer Corps. But one day, he developed the mark. He should be happy because he will be able to gain power, but he has to pay the remaining life as the price. Therefore Michikatsu tried to win over his brother Yoriichi by turning into a demon.

The two did not meet for a long time after that, and they met again for the first time after 60 years. Originally he was supposed to die at the age of 25, but Yoriichi had become a "wrinkled old man" and reached 80. He was born with a bruised mark, but his body was "Natural Born Strong" that he outlived his life.

Therefore, even when he Yoriichi over 80 years old, he still overwhelmed Kokushibo, his brother.

Even though he was transformed into a demon of the Upper Rank 1, Kokushibo was still no match for his aged former brother.

In the end, he died from "old age" not from battle damage.

Yoriichi Tsugikuni was the strongest in the world, from birth to death.


One of the features of Yoriichi is the "Crimson Red Nichirin Blade". The Red Sword shines red when it is heated. It can be said that the Red Sword is simply in a hot state, and the regeneration speed of a demon cut by this sword is extremely degraded, even for Muzan Kibutsuji.

Although the pillars of the modern era finally transformed the Nichirin Blade into the Bright Red Blade when they were about to die, it seems that Yoriichi had been consistently holding onto the Bright Red Blade throughout his life. From this one point, we can easily anticipate the strength of Yoriichi.

Yoriichi Tsugikuni was so strong that he almost killed Muzan Kibutsuji


Yoriichi Tsugikuni almost killed the demon's founder, Muzan Kibutsuji. 

Yoriichi Tsugikuni gave a single blow when encountered Muzan. Although Muzan has multiple hearts and brains, even these were seen through by Yoriichi, who severed them with on pinpoint.

Yoriichi's lack of murderous energy caused Muzan to be completely unguarded and caught him. Even so, the difference in strength between the two of them was obvious. After that, Muzan, fearing that he would be killed, did not go out until Yoriichi died. Muzan is truly humiliated by Yoriichi.

Muzan flung his own body into about 1,800 pieces to escape. Even so, Yoriichi cut off 1,500 pieces of splattered flesh to keep his enemy from escaping. Yoriichi is strongest in this scene.

It's exactly the kind of strength that can make Muzan tremble miserably with "the first attack". They are not evenly matched in strength. If they are evenly matching in strength, there is no way that Muzan would back off from this battle.

Acknowledging Yoriichi so much, but unwilling to admit defeat to Yoriichi Tsugikuni, Muzan even said:

"The real monster is that man, not me".

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Wow, Yoriichi Tsugikuni is so cool and strong! I like him! Thanks for the explanation.
No problem.
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Katanakaji no Sato-hen

The "Entertainment District Arc" is followed by the "Katanakaji no Sato-hen".

The "Katanakaji no Sato-hen" begins with episode 98 in volume 12 of the original work.

※By the way, the original story of Demon Slayer was completed in volume 23, which was released on December 4, 2020.

Tanjiro goes to the village of swordsmiths and meets the love Hashira, Mitsuri Kanroji, and the Mist Hashira, Muichiro Tokito. Fans who cannot wait for the anime adaptation should read the original 12 volumes.


  • Writer of this post


I’m a 23-year-old Japanese anime geek. I love anime and it is the thing that sustains and refreshes my life. I want more people to know about anime. That's why I write articles about my favorite anime.

-Demon Slayer
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