If you loved Demon Slayer: Kimetsu no Yaiba -To the Swordsmith Village-, try Demon Slayer: Kimetsu no Yaiba Mt. Natagumo Arc
A bridge between a film you've already seen and one most people haven't. Here's what they share, and what the second one does that the first one doesn't.
You already loved

Demon Slayer: Kimetsu no Yaiba -To the Swordsmith Village-
→
Try this next

Demon Slayer: Kimetsu no Yaiba Mt. Natagumo Arc
What they share
Both films are directed by Haruo Sotozaki, and they both carry the foreign gem, playful mood tags, and they sit in Action / Animation / Fantasy / Thriller territory. If that's the register that drew you to Demon Slayer: Kimetsu no Yaiba -To the Swordsmith Village-, the second film will land in a comparable space — through a different lens.
foreign gemplayful
What Demon Slayer: Kimetsu no Yaiba Mt. Natagumo Arc is
Mountain forest darkness falls on rusted swords. Tanjiro and fellow slayers track missing persons. A classic shonen anime battle unfolds.