Short answers, pulled from the story.
Haruo Sotozaki served as director of Demon Slayer: Kimetsu no Yaiba the Movie Mugen Train. Akira Matsushima and Manabu Kamino worked as animator and editor respectively for the production.
Demon Slayer: Kimetsu no Yaiba the Movie Mugen Train opened in Japan on the 16th of October 2020. The film was announced on the 28th of September 2019 following the airing of the anime series season finale.
The worldwide box office total for Demon Slayer: Kimetsu no Yaiba the Movie Mugen Train is over $512.7 million from more than 41 million tickets sold. It became the highest-grossing film of 2020 and the highest-grossing Japanese film of all time.
Akaza fatally injured Kyojuro Rengoku by impaling his solar plexus during their battle. Kyojuro died after succumbing to his injuries while protecting passengers, but he honored Tanjiro Kamado with instructions about his family estate before passing away.