Kimetsu no Yaiba - Season 1

What Are You Going Through? Attention and Force in Demon Slayer

Near the end of the first episode of Demon Slayer/Kimetsu no Yaiba, a boy kneels in the snow beside the sister who has just tried to eat him. Tanjiro Kamado’s family has been slaughtered. His sister Nezuko has been turned into a demon. A swordsman named Giyu Tomioka stands over them both, blade drawn, ready to do what demon slayers do. Tanjiro, unarmed and outmatched, begs him not to, and then tries to fight him. What saves Nezuko is a gesture. Wounded and starving, she stands over her unconscious brother and protects him instead of feeding on him. Giyu sheathes his sword. The rest of the series follows from that pause: a predator turning away from its prey, and someone with a sword choosing to look before he cuts.

The 2019 adaptation from Ufotable, built from Koyoharu Gotouge’s manga, became a national event in Japan and then a global one. It is often described as a triumph of animation, and it is. Its water-breathing sword techniques ripple across the screen like moving woodblock prints, and its nineteenth episode is one of the most widely shared sequences in recent television animation. But the show is more interesting than its spectacle. Underneath the fights, it is a sustained meditation on a question Simone Weil spent her short life asking: what happens to a person when force passes through them, and what, if anything, can interrupt it?

The Poem of Force, Retold in Blood

In her 1940 essay on the Iliad, Weil argued that the true hero of Homer’s epic is not Achilles or Hector but force itself. Force, she wrote, turns whoever is subjected to it into a thing. It does this to the dead body in the dust, but also to the living: the captive, the suppliant, the soldier who kills without thinking. Above all, Weil insisted, force petrifies those who wield it as much as those who suffer it. Nobody truly possesses it. It passes through people and empties them out.

Demon Slayer’s demons are this idea made literal. Each was once a person. Each was offered, usually in a moment of despair, the blood of Muzan Kibutsuji, the progenitor of all demons, and with it strength, regeneration and near-immortality. What they lose in exchange is everything that made them someone: memory, kinship, the capacity to want anything except more. The hand demon at the Final Selection has eaten so many children that his body is a knot of grasping arms, and he cannot remember the older brother whose hand he once held. The Temari demon thinks she is playing a game. The Drum House demon, Kyogai, cannot remember why it mattered that someone stepped on his manuscripts. Force has hollowed them so thoroughly that their monstrousness is mostly absence: hunger where a self used to be.

The show’s most important structural choice is when it gives these demons their memories back. It is almost always at the moment of death. As a severed head crumbles into ash, the creature sees again the person it was: a sick child, a betrayed sibling, a writer whose work was mocked. Weil described affliction (malheur), the extreme condition she distinguished from ordinary suffering, as something that stamps the soul with the mark of slavery and robs it of language. The afflicted cannot say what has happened to them. Demon Slayer gives its demons this form of speech only at the end, as if personhood can only return once force has finished with them.

Attention as a Sense

Against all of this the series sets Tanjiro, and what makes him remarkable is not his strength. His defining trait is a supernaturally keen sense of smell, and the show uses it almost entirely as a moral organ. Tanjiro smells lies, fear and, most often, sadness. In the hand demon’s death he smells grief. When a demon dissolves, he takes its hand.

Weil’s name for this faculty was attention. In her essay on school studies, she wrote that love of one’s neighbor, in its fullness, consists in being able to ask: “What are you going through?” Attention for Weil was not concentration in the ordinary sense, not the furrowed brow of effort. It was a kind of waiting: an emptying of oneself so that the reality of another person, especially an afflicted one, could enter without being distorted by one’s own needs. She called it the rarest and purest form of generosity.

Tanjiro’s nose literalizes this. He cannot help perceiving others’ suffering; it arrives unbidden, like a scent on the wind. The show’s cleverness lies in making attention sensory and involuntary rather than heroic and chosen. Tanjiro does not decide to pity demons out of principle. He simply perceives them more completely than anyone around him, and pity follows from perception. When the Hashira Shinobu Kocho asks him why he feels for creatures that devour children, he doesn’t have a theory. He has a nose.

This is also where the series locates its most quietly radical character. Nezuko, muzzled by a bamboo gag for most of the season, refuses to eat human beings. She sleeps instead, for days, recovering her strength through rest rather than consumption. Weil believed that grace enters only through a void, through the refusal to fill every emptiness with what gravity offers. Nezuko is the show’s image of that refusal: a creature built by force to consume, choosing hunger. It’s hard not to think of Weil herself, who died in 1943 having refused to eat more than the rations available to people in occupied France. The parallel is not one the show intends, but it clarifies what Nezuko’s abstention means. Her silence is not just a plot device. It is the form her resistance takes.

The Face That Is Cut Anyway

Here the show runs into a problem Weil alone cannot fully name, and Emmanuel Levinas helps. For Levinas, the face of another person is the origin of ethics: before any principle or argument, the face issues a command, you shall not kill. The face is naked, exposed and defenseless, and that very vulnerability makes a claim on us that comes before choice.

Demon Slayer stages this encounter over and over, and then refuses its conclusion. Tanjiro sees the face of the dying demon, the child behind the monster, and he has already killed it. The ethical encounter arrives after the blade. The show never pretends this is resolved. It is the central tension of Tanjiro’s character: the most perceptive person in the story is also a professional killer, and his compassion does not stop his sword.

Levinas offers a way to understand this that Weil’s purer vision tends to resist. The face of the Other commands infinitely, but there is never only one Other. There is always what Levinas called the third, the other person standing beside the one in front of me, whose claim is just as absolute. Justice begins when I have to weigh faces against each other, compare the incomparable, and act. The demon’s face says do not kill me; the faces of the children it will eat say the same thing. Tanjiro kills because there is a third party. His tenderness at the moment of death is how he refuses to let justice make him forget the face he had to sacrifice to it.

The defining scene of the season’s climax at Mount Natagumo plays this out precisely. Rui, the spider demon, has built a counterfeit family of demons bound to him by terror, a parody of love maintained by force. When he dies, Rui remembers that his parents, horrified by what he had become, tried to kill him and then themselves, and that he understood only too late that they meant to die alongside him and atone together. Giyu, the Water Hashira, steps on the demon’s empty clothes. Tanjiro stops him: this was not a monster, it was a person who had been made into one. Giyu is not wrong that Rui was dangerous. Tanjiro is not wrong that he was a child. The show holds both claims at once, and that refusal to collapse them is its moral intelligence.

Pastoral Power and the Breathing Body

Where Weil and Levinas illuminate Tanjiro’s inner life, Michel Foucault is useful for the institutions around him, and those institutions are more ambiguous than the series fully admits.

Muzan’s regime is the easiest case. Every demon carries his blood, and through it he can see what they see, hear what they think, and kill them at will. A demon who speaks his name dies. In the season’s final episode, Muzan summons his lower-ranked servants, the Lower Moons, to a shifting, impossible space, reads their thoughts and executes nearly all of them for the crime of private doubt. This is power that lives inside the body of its subjects, that makes surveillance unnecessary because the watched have become the watching. It is the panoptic dream perfected: discipline so internalized that disobedience is not just punished but biologically fatal.

The Demon Slayer Corps is designed to look like Muzan’s opposite, and in many ways it is. But Foucault would notice the family resemblance. Its leader, Kagaya Ubuyashiki, visits the graves of fallen swordsmen and knows every member’s name. He is warm, wise and dying. He is also a textbook instance of what Foucault called pastoral power: the shepherd who cares for each sheep individually, knows its conscience and asks for its total obedience in return. The Corps operates outside the law of the Taisho-era state (swords have been banned), recruits orphans and the bereaved, monitors its members through message crows and sends teenagers to die. The Hashira trial in the season’s penultimate arc, where Tanjiro and Nezuko are bound and judged by the Corps’s elite, is a tribunal in which the master’s word settles everything.

Even Tanjiro’s goodness is trained. Total Concentration Breathing, the technique that makes demon slayers superhuman, is a regimen of breath, posture and endurance drilled into the body until it becomes automatic. The rehabilitation arc that closes the season, in which Tanjiro learns to breathe in that way even while asleep, is almost a parody of Foucault’s “docile bodies”: individuals made both more capable and more governable through ceaseless correction of the body.

Here Foucault and Weil disagree in a way that sharpens both. Weil believed attention could and should be trained: the point of school exercises, she argued, was not to master geometry but to strengthen the capacity for attention that could later be turned toward God or a suffering neighbor. Discipline, for her, was a path to grace. Foucault would ask whose purposes the discipline serves. Demon Slayer suggests an unresolved answer: the Corps trains Tanjiro to kill demons more efficiently, and incidentally sharpens the attention that makes him mourn them. The institution produces a better weapon and, by accident, a better soul, and the series doesn’t pretend these are the same thing.

Where the Grace Runs Out

For all its achievement, the series has limits, and Weil’s thought helps locate them precisely.

The first is formal. The death-flashback structure becomes, over twenty-six episodes, a formula. A demon is defeated, a piano swells, a memory unfolds, tears are shed. The first few times, this is devastating. By the later arcs, the audience has learned to anticipate pity, and pity anticipated is pity half-consumed. Weil distrusted precisely this: attention that has become a technique, compassion that has become a reliable effect.

The second limit is more pointed. The show’s compassion is conditional. Demons earn Tanjiro’s tenderness by having a sad story, by having been betrayed, sick or abandoned before they fell. Muzan gets none, because the show gives him no story beyond appetite. Weil’s attention, by contrast, asked for nothing in return. The afflicted did not need to justify their affliction with backstory. By making sympathy a reward for narrative, Demon Slayer stops short of the most demanding version of its own ethic.

Then there is the spectacle itself. Weil’s Iliad essay praised Homer for showing force with bitterness and without glorification, never letting the beauty of the fight hide what it does to the fighter. Ufotable’s animation is not bitter. The Hinokami Kagura sequence against Rui, set to its soaring insert song, is spectacularly beautiful violence, and the show’s popularity rests partly on that beauty. A purist would say the series admires force too much to see it clearly. That’s fair, but I think it is also partly the point: the show lets us feel the intoxication of strength so that Tanjiro’s tears afterward land as a correction. Still, the correction does not always win. And the comic interludes, especially Zenitsu’s shrieking and his leering at women, sometimes undercut the gravity the series works so hard to earn.

The Pause

What remains, after the limits are named, is a work of rare seriousness dressed as a shonen action series, one that has persuaded a global audience, many of them young, to sit with the idea that the monster was once a person, and that killing it, even when necessary, is a loss to be mourned rather than a victory to be celebrated. It is a series in which the hero’s greatest power is not his breathing technique but his perception: his inability to stop noticing that other beings suffer.

Weil wrote that the capacity to pay attention to someone in affliction is a very rare and difficult thing, almost a miracle. Demon Slayer is built on that miracle and on its fragility. It returns again and again to the snowy clearing of its first episode, to a sword that pauses, a demon that refuses to feed, a boy who asks, in every way he knows how, what someone else is going through. That the series cannot always sustain the question, that its institutions and its own spectacle keep pulling it back toward force, is not a failure so much as an honest account of how hard the question is to keep asking.