If you loved The Human Condition II: Road to Eternity, try The Human Condition I: No Greater 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

The Human Condition II: Road to Eternity
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The Human Condition I: No Greater Love
What they share
Both films are directed by Masaki Kobayashi, and they both carry the foreign gem, gut punch mood tags, and they sit in Drama / History / War territory. If that's the register that drew you to The Human Condition II: Road to Eternity, the second film will land in a comparable space — through a different lens.
foreign gemgut punch
What The Human Condition I: No Greater Love is
You oversee labor at a Manchurian mine, but then harsh realities test your ideals. The film leaves you with the weight of one man's struggle.