The Ultimate Price: Every Major Character Who Dies In The Infinity Castle Arc (And How)

The Infinity Castle Arc and its subsequent climax, the Sunrise Countdown Arc, represent the most brutal and devastating confrontation in the history of the Demon Slayer Corps. Launched as a desperate, all-or-nothing assault on the Demon King Muzan Kibutsuji, this battle claimed the lives of heroes and villains alike, redefining the meaning of sacrifice in the series. The sheer scale of the casualties is staggering, with the Demon Slayers paying an immense price for humanity's freedom.

As of December 18, 2025, fans are eagerly anticipating the anime adaptation of this arc, which promises to be a visually spectacular but emotionally shattering experience. What follows is a definitive, spoiler-heavy list of every major character—both Demon Slayer and Upper Rank Demon—who perishes within the confines of the Infinity Castle and the immediate battle that follows.

The Fallen Pillars: Every Hashira and Demon Slayer Who Perished

The final battle against Muzan Kibutsuji and his remaining Upper Rank demons saw the Demon Slayer Corps lose a significant portion of its fighting force, including the strongest of the Hashira. Their sacrifices were not in vain, but they represent the true cost of victory.

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1. Shinobu Kocho (The Insect Hashira)

Circumstances of Death: Shinobu Kocho, the Insect Hashira, met her end in a planned, calculated sacrifice against Upper Rank Two, Doma. Knowing she lacked the physical strength to behead a demon, Shinobu spent months ingesting massive, non-lethal doses of Wisteria poison.

During their battle, Doma absorbed Shinobu's body, unaware that her entire mass was saturated with a lethal concentration of the poison—50 times the fatal amount. This sacrifice severely weakened Doma, allowing her successor, Kanao Tsuyuri, and Inosuke Hashibira to deliver the final, decapitating blows.

2. Muichiro Tokito (The Mist Hashira)

Circumstances of Death: Muichiro Tokito, the youngest Hashira, died a hero's death while fighting Upper Rank One, Kokushibo. Despite being cut in half, Muichiro used the last of his strength and resolve to stab Kokushibo and turn his Nichirin blade bright red, a critical action that momentarily immobilized the demon. His sacrifice was instrumental in the combined effort that led to Kokushibo's defeat, proving his immense growth and dedication.

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3. Genya Shinazugawa (Demon Slayer Corps Member)

Circumstances of Death: Genya Shinazugawa, the younger brother of the Wind Hashira, Sanemi, died alongside Muichiro in the battle against Kokushibo. Genya possessed the unique ability to gain temporary demon-like powers by eating demon flesh. After taking devastating damage from Kokushibo, he began to dissolve, a heartbreaking consequence of his power. His final moments were spent desperately trying to speak to his brother, marking one of the arc's most tragic deaths.

4. Gyomei Himejima (The Stone Hashira)

Circumstances of Death: Widely considered the strongest Hashira, Gyomei Himejima played a crucial role in defeating Kokushibo. He later perished during the final, grueling battle against Muzan Kibutsuji in the Sunrise Countdown Arc. His death was due to the severe, accumulated injuries he sustained, compounded by the debilitating effects of activating his Demon Slayer Mark.

5. Obanai Iguro (The Serpent Hashira) and Mitsuri Kanroji (The Love Hashira)

Circumstances of Death: Obanai Iguro and Mitsuri Kanroji, two of the most beloved Hashira, died together from their wounds after the final confrontation with Muzan. They both fought until their last breath, protecting their comrades and ensuring Muzan's defeat. Their tragic end was softened by their final moments, where they confessed their love for each other and vowed to be reborn and marry in a peaceful world.

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6. Tamayo (Demon Ally)

Circumstances of Death: Tamayo, the benevolent demon doctor and ally, sacrificed herself at the very start of the final battle with Muzan. She was absorbed by Muzan, but not before successfully injecting him with four complex drugs she had spent decades developing. These poisons were crucial, as they first prevented Muzan from splitting, then aged him by thousands of years, and finally turned him human, making him vulnerable to the sun.

7. Kagaya Ubuyashiki (Oyakata-sama)

Circumstances of Death: The leader of the Demon Slayer Corps and the 97th Master, Kagaya Ubuyashiki, initiated the entire final assault. Plagued by a terminal illness, he used himself and his family (Amane, Hinaki, and Nichika) as bait. He detonated a bomb inside his house, severely wounding Muzan and trapping him long enough for the Hashira to arrive and for the Infinity Castle to be activated. This act of self-sacrifice was the catalyst for the entire arc.

The Fall of the Kizuki: The Upper Rank Demons Eliminated

The Infinity Castle Arc is also defined by the complete and utter destruction of Muzan Kibutsuji's elite fighting force, the Twelve Kizuki. Their deaths were a testament to the Demon Slayers' unwavering resolve and tactical brilliance.

1. Kokushibo (Upper Rank One)

Cause of Death: Kokushibo, the progenitor of all Breathing Styles and Muzan's strongest subordinate, was defeated by a collective effort. He was overwhelmed by the combined force of Gyomei Himejima, Sanemi Shinazugawa, Muichiro Tokito, and Genya Shinazugawa. He ultimately succumbed to his wounds after Muichiro and Genya's sacrifices, and his own human memories caused him to lose the will to regenerate, leading to his final disintegration.

2. Doma (Upper Rank Two)

Cause of Death: Doma's demise was a direct result of Shinobu Kocho's ultimate sacrifice. After absorbing Shinobu, the massive dose of Wisteria poison in her body began to break him down from the inside. This allowed Kanao Tsuyuri and Inosuke Hashibira, both with deep personal connections to Doma's victims, to successfully behead the demon.

3. Akaza (Upper Rank Three)

Cause of Death: Akaza's death was unique among the Upper Ranks, as it was essentially suicide. During his fierce battle with Tanjiro Kamado and Giyu Tomioka, Akaza was confronted with the painful, long-suppressed memories of his human life as Hakuji, a kind man who had lost his fiancée, Koyuki, and his master, Keizo. Overcome by guilt and sorrow, Akaza lost the will to live and intentionally stopped his own regeneration, letting himself be destroyed.

4. Kaigaku (New Upper Rank Six)

Cause of Death: Kaigaku, the former fellow student and rival of Zenitsu Agatsuma, was defeated by Zenitsu in a dramatic, emotionally charged duel. Zenitsu, using a unique, self-created Seventh Form of Thunder Breathing, managed to behead Kaigaku, avenging their master, Jigoro Kuwajima (who committed suicide out of shame for Kaigaku's defection).

5. Nakime (Upper Rank Four/Castle Controller)

Cause of Death: Nakime, the demon who controlled the labyrinthine Infinity Castle, was not killed by a Demon Slayer, but by Muzan himself. During her battle with the Hashira, Yushiro, Tamayo's assistant, managed to take control of Nakime's mind and Blood Demon Art. To prevent Yushiro from using the castle to crush him, Muzan destroyed Nakime's body, eliminating the threat.

The Legacy of Sacrifice and Topical Authority

The Infinity Castle and Sunrise Countdown Arcs are the pinnacle of the *Demon Slayer* narrative, functioning as a single, continuous "Final Battle" saga. The heavy loss of life, particularly the deaths of four dedicated Hashira—Shinobu, Muichiro, Gyomei, and Obanai—along with Mitsuri, underscores the overwhelming power of Muzan and the Upper Ranks. The arc masterfully uses these sacrifices, like Shinobu's calculated poisoning and Muichiro's selfless stab, to highlight the Demon Slayers' commitment to their cause, ensuring that the ultimate victory over Muzan Kibutsuji came at the highest possible cost.

These casualties provide immense topical authority to the story's themes of human resilience and the tragic beauty of sacrifice. The emotional weight of Genya's final moments with Sanemi, the heartbreaking reunion of Obanai and Mitsuri, and the sheer determination of Tamayo and Ubuyashiki to initiate the attack, cement the Infinity Castle Arc as the most impactful and devastating chapter in the entire *Demon Slayer: Kimetsu no Yaiba* series.