The Box Office Mojo website estimates that the Demon Slayer – Kimetsu no Yaiba – The Movie: Mugen Train anime film earned US$6,399,846 to edge out the new Mortal Kombat film (US$6,200,000) and win their second weekend matchup at the United States box office. However, both films experienced steep revenue drops of over 70% from their first weekend. If their positions hold after the announcement of the final tallies on May 3, 201, Demon Slayer – Kimetsu no Yaiba – The Movie: Mugen Train will be only the second Japanese film ever — and only the second anime film ever — to rank #1 at the weekend box office in the United States. The first Japanese film was Pokemon: The First Movie over 21 years ago.
Demon Slayer – Kimetsu no Yaiba – The Movie: Mugen Train is now the #3 highest-grossing anime film ever (unadjusted for inflation) in the United States with an estimated US$34,118,776 as of May 2, 2021. It surpasses the former #3, Dragon Ball Super: Broly (US$30,712,119), and only trails behind Pokemon: The First Movie (US$85,744,662) and Pokemon 2000 – The Movie (US$43,758,684).
According to The Numbers website, Demon Slayer – Kimetsu no Yaiba – The Movie: Mugen Train is less than US$3.5 million from overtaking The Eight-Hundred as the #1 film from 2020 worldwide.
Demon Slayer – Kimetsu no Yaiba – The Movie: Mugen Train earned US$21,144,800 at the U.S. box office its first weekend, which makes it the second-highest ever U.S. opening for an anime film (unadjusted for inflation), the highest U.S. opening for an animated film so far this year, and FUNimation Entertainment’s largest three-day opening weekend to date. It ranked #2 in its U.S. opening weekend, behind Mortal Kombat (US$22,515,000 in 3,073 theaters).
FUNimation and Aniplex of America began screening Demon Slayer – Kimetsu no Yaiba – The Movie: Mugen Train in theaters in Japanese with English subtitles and with an English dub in North America on April 23, 2021, and will release the film digitally on June 22, 2021. The film opened on over 1,600 screens, including in 4DX and on IMAX cinema.