The film that beat the box office of Spirited Away. I'm not familiar with the franchise, but that's hardly necessary to keep track of what's going on here, nor do I think it is actually worth catching up with the series as it's the bold action sequences that are by far the prime reason for watching this film.
Tanjiro became a demon hunter after his family was murdered. With a couple of fellow hunters he sets out to investigate the Mugen train, where a lot of people have been disappearing. There he meets Rengoku, one of the toughest demon hunters around. He'll need the help of Rengoku to rid the train of its demon, but darker forces are lurking about.
The art style is pretty bold and expressive, the fight choreography is insane, and the animation quality is feature film worthy. The problem is that there's a bit too much filler in between the fights. Some padding is expected, but the characters themselves aren't that interesting and the melodrama takes up too much of the runtime. Still, if you love a good action/fantasy anime, this comes well recommended.