If you loved Heat Wave, try Onimasa: A Japanese Godfather
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.
What they share
Both films are directed by Hideo Gosha, and they both carry the raw mood tag, and they sit in Crime / Drama territory. If that's the register that drew you to Heat Wave, the second film will land in a comparable space — through a different lens.
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What Onimasa: A Japanese Godfather is
You lead a small yakuza clan on Shikoku Island, but your self-image as a chivalrous samurai clashes with your duties, and then tensions rise with your daughter's life. Hideo Gosha directs this crime drama.

