If you loved Samurai III: Duel at Ganryu Island, try Chûshingura
A bridge between a film you've already seen and one most people haven't. Chûshingura has roughly 3.0× fewer votes than Samurai III: Duel at Ganryu Island — it's a deeper cut, not a mainstream recommendation. 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 Hiroshi Inagaki, and they both carry the bittersweet mood tag, and they sit in Action / Drama / History territory. If that's the register that drew you to Samurai III: Duel at Ganryu Island, the second film will land in a comparable space — through a different lens.
bittersweet
What Chûshingura is
You serve a lord in feudal Japan and then betrayal sparks a quest for honor. The director sets a historical tone.

