Review on Demon Slayer: Kimetsu No Yaiba The Movie: Infinity Castle

 Here's an in-depth review of Demon Slayer: Kimetsu No Yaiba – The Movie: Infinity Castle (Part 1) — what is good, what is not, and if it is worth watching. If you have already watched it (or do not wish to read spoilers), you can proceed ahead beyond the spoiler warning.

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Spoiler Warning

There will be light spoilers regarding structure, a few character histories, pacing. Nothing that spoils the major twists, but heads up.

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What the Movie Is & What It Attempts

•Infinity Castle marks the first of a final trilogy set to bring the last big arc ("Infinity Castle") from the Demon Slayer manga to life.

• It continues from the "Hashira Training" arc, propelling Tanjiro, the Hashira (the highest Demon Slayers), and the others to a climactic encounter with Muzan Kibutsuji in his hellish fortress — the Infinity Castle.

• The movie blends epic battles with important flashbacks, particularly delving into the heartbreaking backstories of high-ranked demons. These flashbacks seek to humanize the antagonists, revealing their histories before becoming who they are.

What's Great

1.Visuals & Animation

Ufotable doesn't disappoint, as usual. The animation is detailed, smooth, and breathtaking in action scenes. The Infinity Castle itself is constructed as a weird, ever-changing environment that builds atmosphere and tension.

The combination of 2D and 3D, dynamic camera work, and environmental detail are all lauded.

2.Sound & Music

The soundtrack, the sound effects, and the general sound design contribute to the amplification of fights and emotional scenes. The immersive is even more so for theatrical or IMAX screenings.

3.Emotional Weight & Character Moments

The backstory — particularly of some Upper Rank demons — is emotionally resonant. They add depth to characters who could otherwise be viewed strictly as villains. Tragic moments, remorse, and moral dilemmas are afforded space.

4.Scale & Stakes

Since this is the start of the last arc, the threat is large. Fights are more urgent, there's more at stake, and the tension hangs in the air. The movie doesn't hesitate to make you feel like this is a culmination point in the story.

5.Fan & Box Office Reception

•Critically well-received: Rotten Tomatoes indicates very strong scores, high audience approval.

• In India, it has set pre-booking records for an anime film.  

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What Doesn't Work So Well

1. Pacing Issues

It's the largest shared criticism. Repeated flashbacks break fight momentum, creating structure that feels slightly repetitive: fight → backstory → fight → another backstory. These stops can undermine tension, particularly when there is tense action.  

2. Runtime & Feeling of Partial Completion

At ~155 minutes, the film is lengthy, but it doesn't feel like a "complete" story. Since it's Part 1 of a trilogy, lots of threads are established instead of being tied up; emotionally fulfilling moments are there, but there also exists a feeling of restraint till later installments.

3. Density / Overload

With all those characters, demon ranks, flashbacks, motivations, etc., it might be too much or confusing for some viewers, particularly if they are not well-acquainted with Demon Slayer.

4. Lack of Levity / Relative Absence of Some Fan-Favourite Side Characters

Since the movie is so concentrated on the "last battles" and sentimental baggage, there is less comic relief and lighter moments. Certain characters (e.g. Inosuke, Zenitsu in their normal comedic or supportive roles) see less screen time or are grimmer/straight.  

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Overall Verdict

If you’re a fan of Demon Slayer, especially of the manga or the previous seasons/films, Infinity Castle Part 1 is almost certainly worth watching on the big screen. It delivers what fans want: epic animation, emotional moments, high stakes, and spectacle.

If you’re newer to the franchise, you’ll still enjoy the visuals and action, but some of the character arcs or emotional weight might hit less strongly; the pacing might also feel uneven, given the many flashbacks and dense plot setup.

It’s also best viewed as the beginning of the final act, not as a standalone film. Expect that many questions are setup pieces, not closure.

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My Rating (Out of 10)

If I had to assign a grade: 8-8.5/10. High praise for spectacle, emotion, and visuals; slightly penalized for pacing and uneven structure.

written by 

Sohom Ghosh