Demon Slayer did not become a global phenomenon for a single reason. Several things lined up: striking animation, an easy-to-follow story, and a pair of films that turned each release into an event. The numbers show how far it has travelled.
A Simple Story, Told Beautifully
Koyoharu Gotouge’s story is easy to describe: a boy becomes a demon slayer to save his sister. That clarity let new viewers join at any point. Studio ufotable’s 2019 anime then gave the battles a distinctive look that viewers could recognise in a single frame, which made clips easy to share.
Mugen Train Turned It Into an Event
Mugen Train opened in October 2020 and became the highest-grossing film of 2020. It was the first time a non-American production topped the annual global box office. In Japan it earned about ¥40.8 billion, making it the country’s top film at the time.
Infinity Castle Took It Worldwide
Infinity Castle opened in Japan on July 18, 2025. By mid-November it had passed ¥100 billion globally, the first Japanese film to do so, according to its distributor Aniplex. Its Japanese gross ended just over ¥40 billion, second only to Mugen Train.
Overseas, Crunchyroll and Sony Pictures handled most markets. Their coordinated rollout helped the film open with about $70 million in North America, which is an unusually large debut for a Japanese release.
Repeat Viewing and Fan Loyalty
Anime audiences often return to theatres more than once, and a shared story that fans already know makes each screening feel like a gathering. That loyalty, built over several seasons, gave the films an audience that was ready on opening day.
What Comes Next
The story continues in the next film. Our guide to when Infinity Castle Part 2 is coming out covers what is known so far.
Sources: Nippon.com, The Hollywood Reporter, Cartoon Brew, Wikipedia.