Demon Slayer: Kimetsu no Yaiba Infinity Castle is a 2025 Japanese animated dark fantasy action film based on the “Infinity Castle” arc of the 2016–20 manga series Demon Slayer: Kimetsu no Yaiba by Koyoharu Gotouge. It is a direct sequel to the fourth season of the anime television series as well as its fourth, fifth, and sixth film adaptations, following Mugen Train (2020) and compilation films To the Swordsmith Village (2023) and To the Hashira Training (2024). It is directed by Haruo Sotozaki, produced by Ufotable, and written by the studio’s staff members.

After recovering from Kagaya Ubuyashiki’s trap and subduing Tamayo, Muzan Kibutsuji retreats into his dimensional stronghold, the Infinity Castle, and traps the Demon Slayer Corps inside. The Demon Slayers are separated and begin battling numerous powerful demons as they search for Muzan. Kagaya’s son Kiriya and daughters Kuina and Kanata lead the operation by mapping the Infinity Castle with the Kasugai crows and locating its inhabitants, with former Hashiras Tengen Uzui and Shinjuro Rengoku standing guard.

Officially titled Demon Slayer: Kimetsu no Yaiba – The Movie: Infinity Castle – Part 1: Akaza Returns, it was released in Japan on July 18, 2025, by Aniplex and Toho. It is released by Crunchyroll through Sony Pictures Releasing in select Asian countries in August, before releasing in all other territories the following month. The film broke several box office records and grossed $294 million worldwide in 38 days. It became the highest-grossing film of 2025 in Japan and the third highest-grossing film in the country’s history.