If you loved Fist of the North Star: The Legend of Kenshiro, try Detective Conan: Private Eye in the Distant Sea
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

Fist of the North Star: The Legend of Kenshiro
→
Try this next

Detective Conan: Private Eye in the Distant Sea
What they share
Both films are directed by Kobun Shizuno, and they both carry the raw mood tag, and they sit in Action / Animation / Drama territory. If that's the register that drew you to Fist of the North Star: The Legend of Kenshiro, the second film will land in a comparable space — through a different lens.
raw
What Detective Conan: Private Eye in the Distant Sea is
You sail on a military ship as a free prize cruise turns into a desperate search for possible explosives on board, but the ship's safety hangs in the balance. The director sets a tense pace.