In short
Kagaya Ubuyashiki leads the Demon Slayer Corps in Demon Slayer without being able to wield a sword. Eaten away by a family curse that kills him at twenty-three, blind, half paralysed, he knows the name of every one of his fighters and visits their graves every day. His last decision is to turn his own death into a trap for the first demon.
Contents
He does not fight, barely moves any more, and yet he is the most important person on the human side in Demon Slayer. Kagaya Ubuyashiki leads hundreds of fighters from a hidden house, with a voice and a memory as his only tools.
This article goes back over his path: the child who inherits a responsibility at four, the curse, his method, his relationship with the Hashira, his family and his death. Our page on the directory of the series’ characters places him among the others.
Who is Kagaya Ubuyashiki?
| Profile | Detail |
|---|---|
| Title | Oyakata-sama, the master of the house |
| Function | head of the Demon Slayer Corps |
| Age | twenty-three |
| State of health | blind, his skin eaten away by a curse |
| Since when | he has led since the age of four |
| Wife | Amane Ubuyashiki |
| Children | five quintuplets, a boy and four girls |
| Distinctive feature | he knows the name of every demon slayer |
| Link with Muzan | a common ancestor, a thousand years earlier |
| Death | an explosion he set off himself |
The character appears early in Demon Slayer, at the time of Tanjiro’s trial, and the impression he leaves matches nothing the story had shown until then.
His appearance is that of a dying man. The skin of his face is peeling away in pinkish shreds from the left side of his forehead, his eyes have lost their colour, and his condition worsens from one appearance to the next.
His attitude never changes. The same calm smile, the same measured voice, whatever the situation, even before the creature that has been destroying his family for a thousand years.
The nine Hashira surround him with total deference. These fighters, who argue about everything else, bow before him even when his decisions offend them.
His title already says what kind of authority this is. The demon slayers call him master of the house, never general or commander, and the vocabulary used belongs to the family rather than the army.
He treats his fighters as his children, in fact, and says so out loud. The phrase comes back in every one of his appearances, and none of the Hashira takes it as a figure of speech.
A leader who does not fight
Kagaya Ubuyashiki was never able to fight: ten sword strokes were enough to exhaust him. Yet all nine Hashira bow before him.
The Corps he leads wears the black uniform marked with the character 滅, which you will find among the series’ cosplay outfits.
Demon slayer uniform
Black high-collared jacket with gold buttons, large white ideogram on the back, pleated hakama and white belt.
View the product · from €49.90The curse eating him away
In Demon Slayer, his condition is no ordinary illness. The Ubuyashiki family has carried for a thousand years a curse that kills all its male children before adulthood.
The origin is a blood tie. The first demon, Muzan Kibutsuji, belonged to this family before his transformation, and the line has been paying ever since for having produced this monster.
The symptoms are always the same. A deterioration of the skin that spreads over the whole body, an immune system that gives way, and a death that comes before thirty.
Kagaya is at the final stage during the story. He coughs up blood, no longer leaves his bed in the last months, and ends up covered in bandages, only his mouth uncovered.
Our article on the Ubuyashiki family and its curse details this mechanism, and our article on Muzan Kibutsuji, the first demon presents the one who caused it.
He is honest about what this situation costs him. Kagaya admits to Sanemi Shinazugawa that he tried to wield a sword, that his heart gave out before the tenth stroke, and that he would have liked to fight like him.
A thousand years of curse
The Ubuyashiki have been paying for a thousand years for having produced the first demon. Their sons all die before thirty.
Leader at four
His personal story is crushing, and Demon Slayer delivers it in a few lines. Kagaya takes charge of the Demon Slayer Corps at four, after his father’s suicide.
What follows is no better. Five years later, one of his brothers sets fire to the house and takes the youngest to his death, and their mother dies trying to save them.
So the child inherits an entire organisation and a fatal illness before he is old enough to go to school, and at nine finds himself the only survivor among his siblings.
He then raises his own children with a severity the story explains. The curse dooms them too, and they must be prepared very early to take over the responsibility.
Our article on the Demon Slayer Corps and its history details the organisation he inherits.
The contrast with his character is striking. A man who has been through all that never raises his voice, shows no bitterness, and devotes what little energy he has left to people he sends to die.
Four years old, and a Corps
Kagaya becomes head of the Corps at four, after his father’s suicide. At nine, he is the last survivor among his siblings.
His voice
His main tool in Demon Slayer is not a weapon. Kagaya has a voice and a rhythm of speech that soothe those who listen, to the point of defusing any anger.
The story takes care to show the effect. The Wind Hashira, the most violent of the group, stops dead when he speaks; the Mist Hashira, who is interested in nothing, listens to him attentively.
His way of speaking is calculated. He chooses his words and intonation so that his listener wants to listen, which makes every meeting an exercise in leadership without formal authority.
The technique exists outside fiction. This kind of rhythm has a name in the study of the voice, and the series relies on it to explain the character’s charisma.
Our page about the Hashira of the Demon Slayer Corps presents those he holds together with words.
A disarming voice
The most violent Hashira in Demon Slayer stops dead when Kagaya speaks. His voice takes the place of authority.
What he perceives
Though blind, he perceives more than most Demon Slayer characters. Kagaya senses the presence of humans and demons alike, and gauges their strength without looking at them.
The demonstration comes during the Hashira meeting. He senses each of them as soon as he arrives and is glad none is missing. On the evening of his death, his eyes covered in bandages, he senses Muzan approaching before he hears him.
This perception complements a flawless memory. He knows the name of every member of the Corps, and goes to the cemetery every day to visit the dead as long as his condition allows.
The detail says everything about his method. A man who cannot fight holds his troops together by knowing them one by one, living and dead.
Our article on the Hashira meeting and Tanjiro’s trial tells of this scene.
This knowledge has a tactical function. Kagaya assigns his fighters according to what he knows of them, their character as much as their level, and several assignments in the story can only be explained this way.
He knows every name
Kagaya remembers the name of every demon slayer in the Corps and visits their graves every day, as long as he can walk.
Tanjiro’s trial
The character’s most discussed decision comes early in Demon Slayer. A demon slayer is travelling with a demon, the Corps demands an execution, and the leader rules the other way.
His reasoning rests on concrete elements. Two years without a victim, the letter of a former Hashira, Sakonji Urokodaki, and three lives put up as a guarantee: his, Giyu Tomioka’s and Tanjiro’s.
He adds an argument nobody expected. Tanjiro has met Muzan in person, the first demon has sent killers after him, and Kagaya refuses to let go of this thread that leads to him.
The decision goes down badly with some of the Hashira. Sanemi Shinazugawa cuts his arm to tempt the demon in front of everyone, and it is Nezuko’s refusal that ends the debate. Our article on Nezuko Kamado, Tanjiro’s sister tells what came of this tolerance.
The episode shows the measure of his authority. A dying man imposes a demon on a Corps of demon hunters, and the matter is settled in a single meeting.
A demon imposed on the Corps
Kagaya allows a demon slayer to travel with a demon. It takes Nezuko refusing Sanemi’s blood for the Hashira to give in.
The nine Hashira he holds together with words have their place in the Demon Slayer Corps collection, right down to the series’ jigsaw puzzles.
Hashira jigsaw puzzle
The Hashira lined up in a courtyard, in dark uniforms, Gyomei in the foreground with his red prayer beads.
View the product · from €54.90Amane and the five children
His family has followed the line’s tradition since the start of Demon Slayer. At thirteen Kagaya marries Amane, from a family of priests as the rule laid down centuries earlier to contain the curse requires, and the couple have five children, quintuplets.
The house works like a headquarters staff. His wife assists him, speaks for him when his voice fails, and ends up presiding alone over an emergency meeting of the Hashira.
The children are prepared very early. Kiriya, the son, learns to lead; his sisters handle the Corps’ communications, coordination and archives.
The responsibility falls on them sooner than planned. Our article on the Ubuyashiki family and its curse tells what becomes of these five children.
The cruel detail is the age. The son takes over leadership of the Demon Slayer Corps at eight, in the middle of the story’s deadliest night.
A family headquarters
With the Ubuyashiki, the wife relays, the daughters coordinate and the son learns to lead. The Corps is a family affair.
The trap of his own death
The character’s last scene is one of the coldest in Demon Slayer. Muzan Kibutsuji turns up at his home, in the middle of the night, to kill him and finish off the line.
Kagaya is waiting for him. He strikes up a conversation, talks about his family, the curse, the blood tie that binds them, and keeps smiling throughout the exchange.
The first demon senses nothing. The man lying before him has erased every trace of hatred, intention and fighting spirit, which is the feat the story stresses most about him.
The explosion comes without warning. The whole house blows up, Muzan comes out badly injured, and the next attack falls on him before he has finished rebuilding himself.
His wife and two of his daughters die in the same explosion. Our article on the Infinity Castle and how it works tells what immediately follows.
Not the slightest trace of hatred
Muzan senses no intention in Kagaya before the explosion. The man had erased even his hatred to trap him.
That last night’s visitor has his Muzan Kibutsuji collection, among the figures from across the series.
Muzan suit figure
White hat with a black ribbon, red eyes, black jacket over a white shirt, a child’s hand in his.
View the product · €79.90Why does this trap work?
The plan rests on intimate knowledge of Demon Slayer’s first demon. Kagaya knows the first demon will come in person, out of pride, and that he will take the time to talk before killing.
He also knows what the explosion will produce. Muzan survives everything, but the wound forces him to use his resources to rebuild himself, and the delay gives the Corps time to arrive.
Finally, the operation serves as a signal. The Hashira converge at the same moment, and the final battle begins where the first demon least expected it.
The calculation takes his own death into account. Kagaya had only a few days left to live, and he chooses to use what remained as a weapon.
Our article on the last fight against Muzan tells what follows that night.
A few days used as a weapon
Kagaya had only a few days left to live. He uses them to wound the first demon and trigger the final battle.
What he leaves the Corps
His legacy in Demon Slayer can be measured by what holds after him. The Demon Slayer Corps takes the death of its leader in the middle of the decisive night without falling apart, because the succession had been ready for years.
His son takes over immediately. Kiriya coordinates the battle from outside, with his sisters, and gives orders to fighters twice his age.
His other legacy is moral. After his death the Hashira repeat what he used to tell them, and several of them explain their tenacity by the attention he had paid them.
The curse dies out with Muzan. The epilogue shows his son Kiriya as a centenarian, the oldest man in Japan, which proves right the priest consulted a thousand years earlier.
Our page on all the series’ arcs places this succession in the story.
One last point deserves mention, because it explains the organisation’s solidity. The family has never had a bodyguard in a thousand years of existence, and its protection rests entirely on the secret of its location.
The succession was ready
The Corps loses its leader at the worst moment and holds all the same. His eight-year-old son takes over coordination within the hour.
What the character brings to the story
Kagaya fills a role few fighting manga give a character. He embodies leadership, that is, the part of the work nobody sees, and Demon Slayer devotes as much care to him as to its fighters.
His existence also solves a plausibility problem. An organisation of several hundred people, without public funding, operating throughout the country for a thousand years, requires someone who keeps the accounts, the assignments and the secret.
Finally, the character serves as a counterpoint to the first demon. Both descend from the same family, both lead an organisation, and everything sets them apart in how they treat those who obey them.
The story presses this parallel to the end. One remembers the name of each of his dead, the other executes his subordinates for being late, as our article on the Lower Moons executed by Muzan tells.
Two leaders, one family
Kagaya and Muzan descend from the same line and each leads an organisation. One remembers the names of his dead, the other executes his subordinates.
