Why Did Muzan Fear Yoriichi Until His Last Breath?

Muzan Kibutsuji is powerful, cunning, and nearly impossible to kill, which makes him seem untouchable in the eyes of humans and Demons. But even someone as strong as Muzan had one person who haunted him for centuries — Yoriichi Tsugikuni.

Yoriichi left behind a mark so deep on Muzan’s mind that the Demon lived with fear of him until his very last breath. After all, he was the strongest Demon Slayer of all time. To understand why Muzan held on to this fear for so long, we must look at what made Yoriichi so extraordinary and why Muzan could never erase the memory of their confrontation.

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Yoriichi’s Unmatched Strength

Yoriichi was born with the Demon Slayer Mark, something that only appeared in rare individuals. From a very young age, he possessed godlike strength, speed, and perception, making him unlike any human Muzan had ever seen.

To top it off, he could use the Transparent World, which allowed him to predict movements and attack with unparalleled precision. This ability made him capable of striking faster than Muzan could regenerate, something no other Demon Slayer ever managed to achieve.

Their first and most famous battle seared itself into Muzan’s memory. Yoriichi nearly killed him in a single strike, slicing him into dozens of pieces. Muzan survived only by scattering before his vital organs were destroyed. For someone who had lived centuries without fearing death, this crushing defeat shattered his pride and proved his immortality had limits against Yoriichi’s power.

A Fear That Never Faded

Even after Yoriichi grew old, Muzan never forgot the terror he felt in that battle. What frightened him most was not Yoriichi’s strength or his Sun Breathing, but the knowledge that Yoriichi had nearly erased him from existence with little effort.

This memory stayed with him for hundreds of years, leaving him deeply paranoid about the possibility of another human like Yoriichi being born. It is one reason Muzan took such aggressive measures to eliminate Demon Slayers who carried the mark and watched with suspicion for any signs of figures who resembled Yoriichi, such as Tanjiro.

The Yoriichi And Muzan Aftermath

When Muzan encountered Yoriichi again decades later, he was stunned to see that even in old age, Yoriichi still held onto his immense strength and clarity. Although time finally stopped Yoriichi from finishing the battle, this second encounter only reinforced Muzan’s fear.

Unlike other enemies he had crushed, Yoriichi remained a permanent reminder of his vulnerability. By the end of the story, Muzan’s fear had grown so intense that he still thought of Yoriichi as the one person who could truly end him.

Muzan’s long-standing fear of Yoriichi shows how powerful this legendary swordsman really was. While Muzan fought countless Demon Slayers, only Yoriichi managed to corner him and reveal weaknesses that no one else could touch

This fear lived with Muzan until his final breath, and it symbolized the one undeniable truth: that no matter how strong he became, there would always be someone capable of opposing him.

Release Year	MAL Rating	Animation Studio	Genre	Watch On
April 2019	8.44	Ufotable	Action, Supernatural	Netflix

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