Demon Slayer: Infinity Castle Ending Explained: Who Lives and Who Dies in the Final Battle?

The highly anticipated first part of the ‘Demon Slayer: Infinity Castle’ trilogy was released on September 12, 2025, marking a turning point in the ‘Demon Slayer: Kimetsu no Yaiba’ saga. Packed with high-stakes battles and emotional revelations, the movie focuses on the clash between the ‘Demon Slayer Corps’ and the powerful demons serving under Muzan Kibutsuji.

Demon Slayer: Infinity Castle Ending Explained

Here’s a detailed breakdown of the major fights, character fates, and what the ending means for the upcoming parts of the trilogy.

What Happens in Infinity Castle?

The film showcases three intense battles between the Demon Slayers and the Twelve Kizuki:

• Tanjiro and Giyu face off against Upper Moon 3, Akaza
• Zenitsu confronts his former senior, Kaigaku, now Upper Moon 6
• Shinobu Kocho takes on Upper Moon 2, Doma

Meanwhile, Kiriya, Kuina, and Kanata Ubuyashiki, the remaining children of the Ubuyashiki family, coordinate efforts to locate Muzan, the demon king. Tamayo, a demon doctor, works on a potion that could potentially turn Muzan human.

Demon Slayer: Infinity Castle Ending Explained: Tanjiro vs Akaza

Tanjiro’s battle with Akaza takes centre stage. Using his father's legendary Transparent World ability, Tanjiro hides his fighting spirit and renders Akaza’s Compass Needle ineffective. Despite being beheaded, Akaza continues fighting until memories of his human past return.

The film explores Akaza’s backstory, how he fought to care for his sick father, trained at a dojo, and fell in love with his master’s daughter, Koyuki. After losing her and others to poisoning, Akaza's grief turned into rage, leading him to kill 67 people, an act that caught Muzan’s attention. Ultimately, Akaza’s guilt overwhelms him, and he ends his own life.

Who Dies in Demon Slayer: Infinity Castle?

Three major characters meet their end:

• Akaza – Dies by suicide after recalling his tragic past
• Kaigaku – Defeated by Zenitsu using his powerful Seventh Form: Honoikazuchi no Kami
• Shinobu Kocho – Absorbed by Doma despite her best efforts and deadly poisons

Although brave and determined, Shinobu’s physical limits prove fatal. Doma adapts to her poisons and consumes her, shocking fans and characters alike.

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Who Survives the Demon Slayer: Infinity Castle Final Battle?

• Tanjiro Kamado
• Giyu Tomioka
• Zenitsu Agatsuma

All three warriors survive their respective battles, though severely wounded. Their survival sets the stage for the upcoming showdown against Muzan Kibutsuji.

Where Is Muzan Kibutsuji Hiding?

Locating Muzan remains a top priority for the Demon Slayer Corps. Tamayo's medicine continues to weaken him and even begins turning him human. However, the ‘Infinity Castle’s’ shifting layout makes it nearly impossible to track him down.

By the end of the film, it's revealed that Muzan is hiding inside a cocoon deep within the castle, but his exact location remains unknown.

What’s Next for Demon Slayer?

While ‘Infinity Castle Part 1’ closes with Akaza’s emotional end, the film also plants seeds for what’s next. Brief scenes tease upcoming battles involving:

• Kanao vs. Doma
• Stone and Mist Hashiras are fighting together
• Love and Serpent Hashiras teaming up

These setups hint at even greater challenges and emotional arcs in Part 2 of the trilogy.

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