If you loved American Yakuza, try The Mole Song: Undercover Agent Reiji
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
Theyboth carry the pitch black mood tag, and they sit in Action / Crime territory. If that's the register that drew you to American Yakuza, the second film will land in a comparable space — through a different lens.
pitch black
What The Mole Song: Undercover Agent Reiji is
Reiji Kikukawa, the academy's least-impressive graduate, gets fired on purpose to infiltrate the Yakuza. His police chief invents disciplinary reasons to sell the ruse. The plan’s success hinges on Reiji not getting killed before it even starts.

