19. Demon Slayer X Heidegger

Philosophy, Loved by Cinema

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A masterpiece of our time, tells a story of the glorious victory of finite life.

Currently one of the most popular anime series in the world, <Demon Slayer: Kimetsu no Yaiba> is far from a simple show. Beyond its entertainment value, it presents a very clear theme: the clash between acknowledging and rejecting death. I believe the show is a vivid and dramatic answer to the question that 20th-century philosopher Martin Heidegger explored throughout his life: “What is the meaning of being?”

The lives and deaths of the characters in <Demon Slayer> are a profound embodiment of Heidegger’s central idea of ‘Being-toward-Death’ (Sein-zum-Tode). We are thrown into the world and, at the same time, we move toward infinite possibilities. Of all these possibilities, the most fundamental and absolute destination is ‘death.’ Heidegger believed that most people live their lives in an attempt to avoid this ultimate end. We treat death as something that has yet to come, or something that only happens to others, and we hide ourselves in a meaningless routine and social roles (das Man). Heidegger called this an ‘inauthentic life.’ In contrast, facing the most unique possibility of one’s own death and seeking meaning in life within its finitude is what he called an ‘authentic life.’ <Demon Slayer> vividly visualizes these philosophical concepts by pitting humans against demons.

The demons (Oni) didn’t simply choose immortality out of fear of death. Akaza, the Upper Rank Three, chose immortality because he couldn’t bear the reality of his loved ones’ deaths. Doma, the Upper Rank Two, turned himself into a demon to escape the emptiness of his inability to feel emotions. However, their choices were cowardly escapes from a part of life — its pain — and as a result, they lost their humanity and meaning, trapped in an inauthentic existence. Their endless lives made them meaningless beings. Their memories and emotions were gradually erased, leaving nothing but slaughter and desire. It is ironic that Muzan Kibutsuji, the king of the demons, for all his immense power, could not take a single step away from his fear of death. In this way, demons exist forever but can never be said to be ‘living.’ Their immortality is not life but a prolongation of endless emptiness. The moment they ran from death, they were expelled from the world of the living.

In contrast, the lives of the Demon Slayers are the very essence of Heidegger’s authentic existence. They are aware that death is imminent at every moment, and they do not shy away from the finitude of life. To them, ‘Total Concentration Breathing’ is not just a combat technique. The act of inhaling and holding their breath simultaneously signifies ‘fully existing in the present moment.’ They understand the preciousness of their limited time, so they pour everything into every breath and every sword strike. Furthermore, their breathing techniques are not just skills but a history imbued with the lives and deaths of countless swordsmen. Tanjiro’s inheritance of the ‘Hinokami Kagura’ even demonstrates Heidegger’s concept of ‘temporality,’ where the past influences the present. All of their training and battles are a preemptive decision to accept the possibility of death at any moment and a struggle to find meaning in life.

The death of Kyojuro Rengoku, the Flame Hashira introduced in the Mugen Train arc, is the climax of this philosophical discussion. Akaza, the demon, tempts Rengoku with an offer of immortal life, a call to an inauthentic existence. But Rengoku firmly rejects the offer and chooses his finite human life.

“To grow old and to die is the beautiful part of a transient creature called a human being.”

As this famous line suggests, he does not avoid his death but fully embraces it. Heidegger emphasized not just the passive acceptance of fate but the active choice of meaning on top of one’s death. Rengoku’s death is a perfect example of this. His death was not just a sad event. Rengoku’s resolve strengthened Tanjiro’s resolve, and his will was eternally etched into Tanjiro’s heart in the form of a spirit.

Ultimately, <Demon Slayer> is not a story about conquering the fear of death but a work that shows how meaningful and powerful life can become when one faces death. The show depicts the victory of a life that can only be completed by embracing death. It is rare to see Heidegger’s complex philosophical propositions expressed in such a beautiful and dramatic narrative.

<Demon Slayer> shows the glorious victory of finite life, a victory that those who deny death can never achieve. It is a masterpiece of our time, philosophically, visually, and entertainingly.