I am muzan kibutsuji I was born in the heian era I was born weak and had a deadly disease but because of the blue spider Lily I became an Immortal and I was cured of my disease but also because of the blue spider Lily I became the first demon and I lived for a long time and my face doesn't age but my only weakness is the sun so I need to find the blue spider Lily again so I can be able in the sun I am also known as the king of demons. I am a cruel, merciless Demon who likes to kill humans.