If you loved Kabaneri of the Iron Fortress: The Battle of Unato, try Attack on Titan: Chronicle
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.

Kabaneri of the Iron Fortress: The Battle of Unato

Attack on Titan: Chronicle
What they share
Both films are directed by Tetsuro Araki, and they both carry the dread, epic, raw mood tags, and they sit in Action / Animation territory. If that's the register that drew you to Kabaneri of the Iron Fortress: The Battle of Unato, the second film will land in a comparable space — through a different lens.
What Attack on Titan: Chronicle is
You wake in a city whose walls shelter from Titans but divide you from the world. Then the colossal breaks through. The director pares the first three seasons into a two-hour sprint, taut walls become battlegrounds. The film leaves you standing where the story began, humbled by its pace.