What is Wrong with the Master in Demon Slayer?
The Master, Kagaya Ubuyashiki, suffers from a hereditary illness that causes his skin to deteriorate, leaving him severely weakened.
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Kagaya Ubuyashiki has a hereditary sickness that makes his skin look scarred and causes him to die young.
To be brief, he's got a rare, family-inherited condition that deteriorates his health and looks over time.
Kagaya's condition is a genetic curse passed down through the Ubuyashiki bloodline, causing him great pain and disfigurement.
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