The fight between Yoriichi Tsugikuni vs. Muzan Kibutsuji is one of the most fierce moments in Demon Slayer. Muzan was the most powerful demon. Yoriichi was the strongest Demon Slayer in history. Their fight was short but changed everything.
But who would win if they fought again? Let’s see here.
To understand this legendary rivalry, it helps to explore the origins of Sun Breathing in Demon Slayer, which Yoriichi pioneered.
⚠ Spoiler Alert: This article consist of manga spoilers.
Who Is Yoriichi Tsugikuni?

Yoriichi Tsugikuni was the strongest Demon Slayer ever. He created Sun Breathing which is the original and most powerful breathing style. He was born with special abilities that made him different from others.
Yoriichi’s Powers:
- Sun Breathing Mastery – The only breathing style that can fully kill demons.
- Transparent World Vision – He could see through enemies and predict their moves.
- Godlike Speed & Reflexes – Faster than any demon or human.
- Demon Slayer Mark – Made him even stronger in battle.
Even among the Hashira, few come close to Yoriichi’s strength—our Strongest Hashira in Demon Slayer article explores how modern slayers compare.
Most thrilling part is when Yoriichi almost killed Muzan in a matter of seconds.
Who Is Muzan Kibutsuji?

Muzan Kibutsuji is the King of the Demons. He also created all demons that could serve him. He has superhuman abilities, regeneration, and deadly Blood Demon Arts. He is nearly immortal, but there is one person he fears that is Yoriichi Tsugikuni.
Muzan’s Powers:
- Regeneration – Heals from almost any injury.
- Blood Demon Arts – Uses deadly attacks that can destroy opponents.
- Shapeshifting & Immortality – Can change his form and survive fatal wounds.
- Super Strength & Speed – More powerful than any other demon.
Even after hundreds of years, Muzan still remembers how Yoriichi almost destroyed him.
Yoriichi vs. Muzan: Power Level Breakdown
Let’s compare their abilities to decide who would win.
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Speed – Winner: Yoriichi
Yoriichi was so fast that Muzan couldn’t react to his attacks.
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Attack Power – Winner: Yoriichi
Sun Breathing is designed to kill demons instantly. Muzan couldn’t heal from Yoriichi’s strikes.
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Endurance – Winner: Muzan
Muzan can regenerate from almost any wound that also makes him hard to kill.
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Fighting Skills – Winner: Yoriichi
Yoriichi had perfect swordsmanship and could predict attacks.
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Regeneration – Winner: Muzan
Muzan’s body heals faster than any other demon, but even the regeneration didn’t work against Yoriichi.
The First Battle: Yoriichi vs. Muzan
Yoriichi and Muzan fought only once, and it ended in seconds.
What Happened in Their Fight?
- Yoriichi landed all his attacks before Muzan could react.
- Muzan’s body was destroyed and couldn’t regenerate fast enough.
- In fear, Muzan escaped by splitting into tiny pieces.
This battle is proof that Yoriichi was the strongest fighter in history.
Could Muzan Defeat Yoriichi if they fought again?
Muzan would still lose even if had more time to prepare.
Possible Battle Outcomes:
- Muzan starts strong but still loses – Yoriichi’s speed is too much.
- Muzan tries to escape again – Yoriichi is fast enough to finish him before that happens.
- A second fight would end the same way.
FAQs
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Did Yoriichi kill Muzan?
No. He almost did, but Muzan escaped before Yoriichi could finish him.
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Why was Muzan afraid of Yoriichi?
Yoriichi was the only person who was completely stronger than Muzan.
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What chapter is Yoriichi vs. Muzan fight happens in Demon Slayer?
Their fight happens in Chapter 187 of the Demon Slayer manga.
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Could any Hashira defeat Muzan like Yoriichi?
No. Even the strongest Hashira couldn’t match Yoriichi’s power.
Final Verdict: Who Wins?
Winner – Yoriichi Tsugikuni
Why Yoriichi Wins:
- Muzan couldn’t land a single hit on him.
- Yoriichi’s Sun Breathing stops regeneration.
- Muzan’s only option was to run away.
Yoriichi would still win even if they fought again.
Conclusion
The fight between Yoriichi vs Muzan is one of the most important points in Demon Slayer. Muzan was no match for Yoriichi’s unmatched power even though he is the Demon King. Yoriichi’s legacy is still felt today, especially in how Tanjiro carries on his legacy—explored in our Tanjiro Kamado character analysis.
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