An Anime Film Event, directed by Haruo Sotozaki

One of the more humorous aspects of the 2025 theatrical season is watching industry insiders utterly baffled by the runaway success of Demon Slayer: Kimetsu no Yaiba – The Movie: Infinity Castle. For two straight weeks, the film held the top spot at the domestic box office. It now sits just ten million dollars shy of surpassing Crouching Tiger, Hidden Dragon as the highest-grossing foreign film ever, ranks within the top ten worldwide releases of the year, and has outperformed nearly every superhero movie released in 2025, including the latest Fantastic Four and Superman installments. Even more impressive, it accomplished all of this on a modest thirty-million-dollar budget, which in Hollywood terms is about the size of a catering bill on many overinflated productions.

Meanwhile, reporters covering the story have been fumbling through Japanese titles and names, framing the success as some kind of odd fluke, and generally downplaying what might be the most exciting cinematic event of the year. Could this be a wake-up call for Hollywood? Probably not in the sense that anime films will suddenly start raking in half a billion worldwide on a regular basis. Still, the possibility that this momentum could shake things up is intriguing. With Chainsaw Man waiting on the horizon, it will be fascinating to see if the trend continues.

“The Demon Slayer Corps are drawn into the Infinity Castle, where Tanjiro and the Hashira face terrifying Upper Rank demons in a desperate fight as the final battle against Muzan Kibutsuji begins.”

So why all the hype? Demon Slayer: Kimetsu no Yaiba – The Movie: Infinity Castle is the first installment in what amounts to the franchise’s final season, reimagined as a trilogy of theatrical films rather than a television series. This bold strategy continues the precedent set by the earlier Mugen Train film, which itself functioned as the show’s second season. That release was something of a last-ditch effort to keep production company Ufotable afloat after serious allegations of tax evasion and embezzlement within the company’s cafe sector. Against the odds, the gamble paid off, with Mugen Train shattering post-pandemic box office records in Japan – records that only this new film is now beginning to eclipse.

Narratively, Infinity Castle centers on the Demon Slayer Corps’ final assault on Muzan Kibutsuji’s stronghold. The castle itself is both fortress and nightmare for anyone trying to attack it, a surreal maze that defies the laws of physics. Stairways twist and ceilings collapse into new floors, rooms rotate without warning, and the very idea of gravity loses its meaning. All of this shifting chaos is orchestrated by Nakime, the eerie biwa-playing demon who can restructure the battlefield or teleport opponents with a single strum. The architecture retains a haunting beauty in its traditional Japanese design, but its shifting scale and instability create a suffocating, dreamlike horror that shakes many of the characters to the core. For Muzan and his followers it is a sanctuary; for the Demon Slayer Corps, it is a trap from which escape feels impossible.

The film largely revolves around three major battles as the Demon Slayer Corps confronts Muzan’s strongest subordinates, The Upper Ranks of the Twelve Kizuki. Fans are treated to Shinobu Kocho facing Upper Two Doma, Zenitsu Agatsuma against Upper Six Kaigaku, and a two-on-one clash featuring Tanjiro Kamado and Giyu Tomioka taking on Upper Three Akaza. Of all the main story beats from the original comic this film is based on, these fights were ranked very highly by fans, so everyone seemed very excited for this. The Akaza battle alone is considered one of the high-points of the entire series and could be the most intense and visually breathtaking fight of the film.

As with any battle in Demon Slayer, fans are treated to spectacular visuals and inventive combat techniques alongside emotional backstories, usually revealed just as the opponent is about to fall or fade away. These segments do not exist to redeem the villains in the sense of turning them into “good guys,” which is a common trope in many shonen shows. Instead, they humanize the characters to a degree and emphasize Muzan as the embodiment of pure evil, preying on the weak or desperate to offer them a shred of power in exchange for their humanity.

The three “Upper” demons in this film have particularly well-detailed backstories that show the circumstances leading them down their dark paths. Upper Two Dōma was neglected by his parents, and forced to be the central figure of a cult due to being born with albinism. Muzan manipulated him to use his followers as a food source for his demon army, as well as a way to escape boredom of the life imposed on him. Upper Six Kaigaku was a selfish young man who betrayed his clan (largely made up of orphans), particularly his classmate Zenitsu, and his teacher Jigoro after being denied the title of true successor to his master’s techniques.

Upper Three Akaza was born into poverty, and became a thief to care for his sick father. After being constantly ground down by society, he endured the deaths of his father, fiancée, and her father, who was also his martial arts teacher and perhaps his last chance at a normal life. It was after a fit of pure vengeance that Muzan found him and fed his hatred, shaping one of the most villainous characters in the series.

If there’s one downside to the film – and honestly, it’s not something that could be easily fixed given how important every scene is, it’s the structure of the Akaza fight. The battle builds to what feels like a major climax, only to be followed by a lengthy flashback sequence that slightly slows the film’s pacing. While this flashback is excellent and arguably one of the best parts of the movie, it does make the film feel a bit unconventional compared to standard story structures. Some casual viewers or non-fans might find this section a little drawn out, and that’s understandable, but even with this brief slowdown, the film maintains a strong, engaging story throughout.

Ufotable’s animation in Demon Slayer stands out because of the studio’s meticulous preparation and cinematic sensibilities. Rather than animating everything on the fly, Ufotable produces key sequences well in advance, allowing them to plan camera angles, lighting, and choreography with a level of precision rarely seen in television anime. And in a film like this, that ramped up even more. This pre-production approach gives each fight scene a fluidity and weight that feels almost live-action, with characters’ movements and attacks flowing naturally across the screen.

Their signature combination of hand-drawn 2D animation and layered digital effects, like swirling wind, water, sparks, or fire, creates a visually stunning spectacle no matter what is going on. Lighting and color grading are carefully chosen to amplify mood and emotion, whether highlighting the tension of a duel or the quiet poignancy of a character moment. Ufotable ensures that the action in Demon Slayer doesn’t just look impressive – it tells a story in motion.

Highlights for me included the flashback during the Akaza fight and the Zenitsu fight, both for very different reasons. The Akaza sequence stood out for its heartbreaking drama in the film’s final moments, which managed to make me feel genuine sympathy for a character who, despite being despicable, only ever wanted love and the ability to care for others. On the other hand, the Zenitsu fight gave long-overdue depth to a character often treated as comic relief. Every flaw, every silly moment throughout the series suddenly had meaning, culminating in a powerful conclusion that offered closure to his dark past. His mastery of a martial arts form once considered simple might sound like a small thing, but the way he built upon it to create a new technique proved that his master was right to name him the true successor to their clan’s legacy.

Overall, Infinity Castle is the anime fan’s cinematic event of the summer. I know not everyone enjoys this franchise, and it’s often fashionable to dismiss anything popular, but the fact that an anime film topped the U.S. box office for two straight weeks, outperforming major Hollywood releases and leaving studio executives stunned, is incredible. It proves that audiences are getting tired of endless reboots, sequels, and recycled superhero stories, and are ready for something fresh. Sure, Hollywood could easily try to cash in on Demon Slayer’s success and overdo it like they have with so many other trends, but for now, anime fans can savor the moment. With Chainsaw Man: Reze Arc set to release in late October, it will be interesting to see how that film performs – and whether Demon Slayer’s dominance was a one-time phenomenon or a sign of a broader shift in audience tastes.