If you loved Kamui, try Doing Time
A bridge between a film you've already seen and one most people haven't. Doing Time has roughly 3.5× fewer votes than Kamui — 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 Yōichi Sai, and they sit in Drama territory. If that's the register that drew you to Kamui, the second film will land in a comparable space — through a different lens.
What Doing Time is
Here's a movie that thinks prison is like summer camp. A man is sent to a minimum-security prison where the inmates have settled into a highly structured, if dull, routine. The film certainly gives you a lot of time to ponder its themes.

