If you loved Digimon Frontier: Revival of Ancient Digimon, try Fist of the North Star: The Legend of the True Savior: Legend of Raoh-Chapter of Death in Love
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

Digimon Frontier: Revival of Ancient Digimon
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Fist of the North Star: The Legend of the True Savior: Legend of Raoh-Chapter of Death in Love
What they share
Both films are directed by Takahiro Imamura, and they sit in Action / Animation territory. If that's the register that drew you to Digimon Frontier: Revival of Ancient Digimon, the second film will land in a comparable space — through a different lens.
What Fist of the North Star: The Legend of the True Savior: Legend of Raoh-Chapter of Death in Love is
You lead a platoon of starving villagers trapped between two warlords. When Raoh’s cavalry appears on the horizon you feel the sky darken. Nearby, your wounded brother whispers the name Reina over and over.