How did Muzan Kibutsuji become a demon in Demon Slayer?
How does the first demon become a demon in Demon Slayer?
We need to go back 1,000 years to when Muzan Kibutsuji when was still a human.
The issue all begins with his heart-stopping more than once in his mother’s womb.
Once he was first born, he had no pulse and was not breathing as well.
He did not die and cried at once to escape his own death.
Also, Muzan was diagnosed with a rare disease that would kill him early on in life.
There was a doctor that did everything he could to help Muzan get better.
What does the doctor use to cure Muzan Kibutsuji ?
He dosed Muzan with medicine made from Blue Spider Lily.
Unfortunately, Muzan did not recover.
Then he got frustrated by how his condition was getting worse.
Then Muzan killed his own Doctor before he could finish all the treatments.
After he killed the Doctor, he then realized the medicine was actually working.
It helped him acquire a non-human body and strength over time.
Then it made him crave human flesh as well.
At what point does Muzan Kibutsuji become a demon in Demon Slayer?
Whatever the doctor had used to make the medicine with the Blue Spider Lily granted Muzan to become immortal at some point.
That had transformed Muzan Kibutsuji into the world’s first demon in Demon Slayer.
