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Demon Slayer Infinity Castle trailer leaks: Here’s what you missed

The upcoming Demon Slayer: Infinity Castle movie, adapting the manga's final arc, faced an unexpected trailer leak after a secret screening in Japan. Studio Ufotable and Aniplex swiftly responded with piracy warnings, while Crunchyroll assured fans of an official trailer release soon. Despite mixed reactions to the leak, anticipation remains high for the film's global premiere in late summer 2025.
Demon Slayer Infinity Castle trailer leaks: Here’s what you missed
Credits: AnimeMojo
Demon Slayer: Kimetsu no Yaiba has exploded in popularity worldwide, drawing millions of fans with its emotional story and stunning animation. Set in Japan’s Taisho era, it follows young Tanjiro Kamado, who joins the Demon Slayer Corps after his family is killed by demons and his sister Nezuko is turned into one. Together with allies like Zenitsu and Inosuke, Tanjiro fights fearsome demons led by the immortal Muzan. The series’ latest chapters – known as the Infinity Castle arc – depict a climactic final battle as Tanjiro and the elite Hashira warriors storm the demons’ fortress to confront Muzan. In India and other countries, Demon Slayer films have been box-office successes; for example, the “Hashira Training” movie became the highest-grossing foreign film in India in 2024. Fans around the globe eagerly await the first Infinity Castle movie, slated to open in Japan on July 18, 2025.

Infinity Castle: The final showdown

Infinity Castle: The final showdown (Credits: YouTube)
Credits: YouTube
Demon Slayer’s Infinity Castle movie will adapt the saga’s final story arc – a three-part climax never before fully seen on film. In the manga, Tanjiro and the Hashira (the Corps’ top fighters) are drawn into a nightmarish dimension called the Infinity Castle, where Muzan Kibutsuji orchestrates the last stand against humanity. Studio Ufotable and producer Aniplex announced Infinity Castle immediately after Season 4 ended. It’s expected to conclude Tanjiro’s journey on the big screen; Infinity Castle will be the first fully original Demon Slayer movie since 2020’s hit Mugen Train.

Trailer leak sparks stir

When Japanese theaters began re-running Mugen Train in 4K on May 9, 2025, they secretly screened an exclusive sneak-peek of Infinity Castle. The new trailer (just 60 seconds long) was meant only for cinema audiences. However, some viewers covertly filmed the preview and posted the low-quality clip online. The leaked footage quickly spread through fan sites and social media. It showed quick flashes of Tanjiro, Zenitsu, and other heroes preparing for battle inside the ominous Infinity Castle. By May 11, news of the leak was everywhere – enough that the official Demon Slayer team felt compelled to address it.

Official studio response

Within days the Demon Slayer production team issued stern warnings. The official Demon Slayer X (formerly Twitter) account announced that a “secretly recorded video of the theater-exclusive trailer” had appeared on the internet. The post reminded fans that filming movies in a theater is illegal under Japanese law. It quoted the penalties for piracy – fines up to 10 million yen and up to 10 years in prison for unauthorized recording or uploading. Aniplex, the series’ producer, also took to social media to echo the warning, stressing that copyright infringement “could result in a hefty fine or even prison time”.
Official studio response (Credits: YouTube)
Credits: YouTube
At the same time, Crunchyroll (the overseas distributor) clarified that the official trailer will be shown properly. North American cinemas will legally show the same Infinity Castle trailer starting May 14, 2025 with Mugen Train revival screenings. In other words, there will soon be a high-quality official version for fans. Studio staff urged patience, reminding viewers that the full Infinity Castle film opens in Japan on July 18, 2025 and rolls out worldwide later in August and September.

Fan reactions from social media

Reactions on Twitter (X) and fan forums have been mixed but mostly excited. Many fans expressed frustration at the marketing strategy of hiding the trailer in theaters only – they felt the leak was “inevitable” under the circumstances. Some joked at the warning message. One fan quipped, “First try catching the guy who recorded it… keep up the drama!”. Another joked that “tomorrow there will be about 5 leaks at once,” teasing that international fans would film their own clips.On the other hand, some fans were actually relieved to see any glimpse of new content. A number of viewers said the studio had made them wait too long, and they were glad someone finally shared footage of the movie. Fan blogs noted that the community is “upset about the overall marketing strategy” but still overwhelmingly excited for Infinity Castle. At the same time, many fans warned each other not to watch the shaky leaked video – preferring to experience the trailer in better quality. In general, the sentiment remains optimistic: followers of Demon Slayer are buzzing with excitement and hope that the official trailer and film will soon give them the full blockbuster experience.
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TOI Entertainment Desk

The TOI Entertainment Desk is a dynamic and dedicated team of journalists, working tirelessly to bring the pulse of the entertainment world straight to the readers of The Times of India. No red carpet goes unrolled, no stage goes dark - our team spans the globe, bringing you the latest scoops and insider insights from Bollywood to Hollywood, and every entertainment hotspot in between. We don't just report; we tell tales of stardom and stories untold. Whether it's the rise of a new sensation or the seasoned journey of an industry veteran, the TOI Entertainment Desk is your front-row seat to the fascinating narratives that shape the entertainment landscape. Beyond the breaking news, we present a celebration of culture. We explore the intersections of entertainment with society, politics, and everyday life.

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