If you loved The Mole Song: Undercover Agent Reiji, try The Mole Song: Final
A bridge between a film you've already seen and one most people haven't. The Mole Song: Final has roughly 4.5× fewer votes than The Mole Song: Undercover Agent Reiji — 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 Takashi Miike, and they both carry the playful, unhinged mood tags, and they sit in Action / Comedy / Crime territory. If that's the register that drew you to The Mole Song: Undercover Agent Reiji, the second film will land in a comparable space — through a different lens.
What The Mole Song: Final is
Takashi Miike's gangster saga seemingly refuses to end. An undercover cop boards a cruise ship to stop ¥600 billion in drugs from entering the country. It's difficult to imagine which is more exhausting: the mission or the film itself.

