Why Does Kagaya Ubuyashiki Sick In Demon Slayer? Explained

The world of anime is brimming with fantastical worlds, iconic characters, and compelling narratives that resonate with its audiences worldwide. One such phenomenal piece of animation is the Demon Slayer,where supernatural and human elements blend seamlessly. Among the significant characters, Kagaya Ubuyashiki’s mysterious illness becomes a topic of deep intrigue. You may wonder, why does Kagaya Ubuyashiki get sick in Demon Slayer? Let’s delve into the depth of this query and uncover the secrets.

Demon Slayer, also known as Kimetsu no Yaiba, sets forth a realm where demons and slayers coexist, battling for supremacy and survival. Kagaya Ubuyashiki, the enigmatic head of the Demon Slayer Corps, suffers from an undisclosed illness, a crucial point of the storyline that often leaves viewers puzzled. What’s the reason behind this affliction? What impact does it have on the narrative? We’re about to demystify these complex questions and more.

Disclaimer: This article contains spoilers from the Demon Slayer manga.

Kagaya Ubuyashiki
Kagaya Ubuyashiki (Image Via Ufotable)

The Ubuyashiki Family Curse: A Legacy of Suffering

The Ubuyashiki family, the oldest and most respected lineage in the Demon Slayer universe, carries a grave and unfortunate curse. In simple terms, the head of the family, Kagaya Ubuyashiki, and his ancestors are doomed to live brief lives due to an unexplained illness. Isn’t it a paradox that the very people who protect humanity from demons have been cursed with a shorter lifespan?

The Ubuyashiki family’s curse originates from their ancestor’s unfortunate encounter with Muzan Kibutsuji, the primary antagonist and the first demon of the series. Muzan, enraged by the ancestor’s interference, inflicted a curse upon the Ubuyashiki bloodline, forcing them to live short, sickly lives. This tragic turn of events reveals an irony – the Ubuyashiki clan, responsible for protecting humanity, lives under a demonic curse, their lives filled with suffering.

The Illness of Kagaya Ubuyashiki in Demon Slayer: A Catalyst for Change

Kagaya Ubuyashiki’s illness is not just a random subplot added for dramatic effect; it plays a pivotal role in shaping the narrative. Despite his ailing health, Kagaya demonstrates an unwavering commitment to his duties. His disease does not deter him; instead, it serves as a constant reminder of the grave responsibility he carries on his frail shoulders.

With his life in constant peril, Kagaya understands the value of each moment. He becomes a compassionate leader, whose decisions are governed by a profound sense of empathy for his comrades. His illness also makes him a symbol of perseverance and self-sacrifice, inspiring others to risk their lives for the greater good.


Kagaya’s sickness, however, does more than just shape his character. It drives the narrative forward, creating dramatic tensions, and sets the stage for key events in the series. It signifies the ongoing battle between humans and demons, the conflict between vulnerability and resilience, and the paradox of a leader burdened by an enemy’s curse.


So, why does Kagaya Ubuyashiki get sick in Demon Slayer? The answer lies in a paradox. His sickness is a direct consequence of his family’s curse, a bitter heritage passed down generations. Yet, his ailment is more than just a physical manifestation. It is a testament to his strength, an emblem of the relentless struggle of humanity against the demonic forces.

In the grand scheme of things, Kagaya Ubuyashiki’s illness serves as a narrative device that propels the plot, adding layers of complexity to the story. It illustrates the dire consequences of the age-old feud with Muzan, and simultaneously, it epitomizes the courage and resilience of the human spirit. Kagaya’s battle with his disease ultimately makes him a beacon of hope and perseverance, illuminating the path for all Demon Slayers.

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