If you loved Sympathy for the Underdog, try Battles Without Honor and Humanity: Police Tactics
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

Sympathy for the Underdog
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Battles Without Honor and Humanity: Police Tactics
What they share
Both films are directed by Kinji Fukasaku, and they both carry the raw mood tag, and they sit in Action / Crime / Drama territory. If that's the register that drew you to Sympathy for the Underdog, the second film will land in a comparable space — through a different lens.
raw
What Battles Without Honor and Humanity: Police Tactics is
You walk Hiroshima’s back alleys just as flashbulbs start popping for the Olympics. The cops pivot from backroom deals to flashy raids, tipping the yakuza balance without warning. Fukasaku’s camera tracks this shift like a metronome counting down to something uglier.