“Demon Slayer -Kimetsu no Yaiba- The Movie: Mugen Train” made history as the first non-Hollywood and non-United States film to top the worldwide box office chart as it now stands at #1 with a worldwide tally of US$474.6 million. The film earned US$435 million in the international box office and US$39.6 million in the United States.
“Funimation’s export of Demon Slayer The Movie: Mugen Train earned another $3 million (-54%) in weekend three. The R-rated, animated action fantasy, a direct continuation of a popular anime (think Fight the Future debuting theatrically between season five and season six of The X-Files) has earned $39.565 million in 17 days. That’s past the (unadjusted-for-inflation) $37 million domestic cume of Guillermo del Toro’s Pan’s Labyrinth, making Demon Slayer the sixth-biggest foreign language grosser ever in North American theaters,” an article released by Forbes read.
Demon Slayer debuted with over $21 million in the US box office in April.
In Japan, the film has sold a total of 28.87 million tickets for 39.88 billion yen (about US$364.9 million) as of May 5 and was ranked #1 for twelve consecutive weeks in Japan box office.

Sources:
https://www.gmanetwork.com/news/lifestyle/hobbiesandactivities/786876/demon-slayer-makes-history-tops-worldwide-box-office-chart/story/?utm_source=GMANews&utm_medium=Facebook&fbclid=IwAR1vPWXTpjJbvdvoblfSdJclskJ5Si8iHWhdsZMFLBdW-Dc2vj1Hxc5UExM
https://www.forbes.com/sites/scottmendelson/2021/05/09/weekend-box-office-demon-slayer-nears-40-million-but-mortal-kombat-tumbles/?sh=4c0682845c68
https://www.animenewsnetwork.com/news/2021-05-09/demon-slayer-is-now-the-no.1-film-from-2020-worldwide/.172584
https://www.the-numbers.com/box-office-records/worldwide/all-movies/cumulative/released-in-2020