During their sleep, the Demon Slayers have idealistic dreams Tanjiro reunites with his deceased family, Kyojuro reminisces on his past with his younger brother Senjuro and alcoholic father Shinjuro, Zenitsu envisions a life with Nezuko, and Inosuke imagines himself as an adventuring leader. In exchange, Enmu will grant them a peaceful sleep. The demon then instructs four passengers, all suffering from severe insomnia, to enter the Demon Slayers' dreams and destroy their spiritual cores to cripple them.

Directly after, all of them except for Nezuko fall into a deep sleep, the work of Enmu, Lower One of the Twelve Kizuki. Soon after boarding, they are attacked by two demons which Kyojuro quickly kills. Tanjiro Kamado, his younger sister Nezuko, and his friends Zenitsu Agatsuma and Inosuke Hashibira board the Mugen Train to assist the Flame Hashira Kyojuro Rengoku in his mission to hunt for a demon that has caused forty people to go missing. The film has received numerous awards, including Animation of the Year at the 44th Japan Academy Film Prize as well as the Best Animation Film at the 45th Hochi Film Award. It set a number of box office records, including becoming the highest-grossing Japanese film of all time. It grossed over $506.5 million at the worldwide box office, making it the highest-grossing film of 2020, the first time a non-Hollywood production topped the annual box office. The film was released during the COVID-19 pandemic, premiering on October 16, 2020, in Japan, by Toho (in partnership with Aniplex) and late 2020 to mid-2021 internationally.

The film was produced by Ufotable in association with Aniplex and Shueisha. The film, which is a direct sequel to the first season of the anime television series, was directed by Haruo Sotozaki and written by Ufotable staff members.

Demon Slayer: Kimetsu no Yaiba – The Movie: Mugen Train ( Japanese: 劇場版「鬼滅の刃」無限列車編, Hepburn: Gekijō-ban 'Kimetsu no Yaiba' Mugen Ressha-hen), also known as Demon Slayer: Mugen Train or Demon Slayer: Infinity Train, is a 2020 Japanese animated dark fantasy action film based on the 'Mugen Train' arc of the shōnen manga series Demon Slayer: Kimetsu no Yaiba by Koyoharu Gotouge.

My chracter does not appear on mugen