How did Muzan Kibutsuji become a demon in Demon Slayer?

Muzan Kibutsuji the main antagonist of Demon Slayer

Muzan Kibutsuji is the main antagonist of the popular series Demon Slayer or Kimetsu No Yaiba. He’s well-known for his merciless nature and being an enigma on screen. 

Fans often wonder about his history. They have several questions like: Was he a human before a demon? What was Muzan’s family like? How did he become a demon? 

For starters, Muzan Kibutsuji is over 1,000 years old. He was born during the Heian era. However, his life was not as easy as it seems like. Eventually, he wanted to attain immortality, which led him to become the first demon or the Demon King. 

Muzan has a very tragic yet challenging backstory. His journey to becoming a demon is quite interesting and he had to undergo immense pain for his survival. Let’s go through the details.

Disclaimer: The following article has spoilers. Reader discretion is advised. 


Who is Muzan Kibutsuji: Exploring his history of becoming a Demon King

Muzan’s early life

Muzan Kibutsuji is evil inacarnate in Demon Slayer
Muzan Kibutsuji summons all the Lower Moon demons in his castle dressed as a woman in Demon Slayer (Image via Ufotable)

Muzan Kibutsuji was born during the Heian era. Over 1,000 years ago, before the Taisho era, he was a stillborn. However, when he was about to be cremated, he coughed up blood on his pyre, showcasing his stubborn nature. 

Muzan has always been a very sick little boy since he was born. During his teenage years, he was diagnosed with a terminal illness that reduced his lifespan to the age of 20. Disheartened to know this, Muzan went on a quest to find a cure for his illness and live long. However, he encountered several obstacles before he could cure himself.


Muzan’s journey to immortality 

Red eyes of Muzan Kibutsuji indicate his demonic prowess in Demon Slayer
Muzan Kibutsuji experimenting with his blood in the quest of immortality in Demon Slayer (Image via Ufotable)

Before his 20th birthday, Muzan roamed Japan to seek help from various medical practitioners to cure himself. He was desperate and was trying to look for a permanent solution that would put him away from his misery. 

During this journey, Muzan was experimented on by several physicians to find a cure for his illness. Gradually, he became desperate to become immortal and get cured of his disease. 

However, there was one physician, who injected him with the concoction of the Blue Spider Lily. After being injected, Muzan didn’t feel any significant change in his body. Out of rage and fear of failure, Muzan killed his physician. 

However, after murdering his physician, he realized that his body is feeling much better than before and now he has gained an inhuman strength. He also found that his eyes gradually became piercing red like blood. 

The medicinal concoction given to Muzan by the physician made him immortal and further made him the first demon in the world.


Muzan’s thirst for Blue Spider Lily

Muzan Kibutsuji in taisho era in Demon Slayer
Muzan encounters Tanjiro in the city in his human form in Demon Slayer (Image via Ufotable)

Once Muzan discovered his inhuman abilities and super strength, he realized that he could not go out in sunlight. The sun exposure burns his skin and causes him to become weak and perish instantly. 

This upset him immensely. He also found his newfound thirst for blood and human flesh. During the nighttime, he started feasting on humans to nourish himself and gain strength. However, it didn’t give him the ability to withstand sunlight. 

To conquer sunlight, Muzan started transfusing his blood to other dying individuals or humans. He created many more demons with his blood to see whether any one of them could withstand daylight or not. 

He bestowed the responsibility upon Akaza to locate Blue Spider Lily. With his doctor’s demise on his own hands, his quested for Blue Spider Lily to conquer sunlight. However, the notes left behind turned out to be insufficient and hence he couldn’t recreate the medicine. 

In the first episode of the Swordsmith Village arc, it was found that Muzan enquired his Upper Moons specially Akaza, about the whereabouts of the Blue Spider Lily. He even got furious when Gyokko didn’t give any positive results. 

The fans are eager to learn about Muzan’s backstory and his connection with Kagaya Ubuyashiki and also about the strengths of the Blue Spider Lily.


Wrapping up…

Muzan has a human family in Demon Slayer
Muzan Kibutsuji with his human daughter and wife to stay incognito in Demon Slayer (Image via Ufotable)

In the first season of Demon Slayer, it was found that Muzan has the ability to mingle with fellow human beings. He also has a human family where he conceals himself as a human. 

This isn’t the first time he has concealed his identity as a human for his survival. He has been doing this for 1,000 years, except during the Sengoku era when Muzan was challenged by Yorichii that made him almost lose his life. 

The Demon King’s life is very tough and he has gone through an immense tragic past. Because of these hardships, it has made Muzan adamant and desperate for immortality.


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