If you loved Kaza-hana, try P. P. Rider
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
Both films are directed by Shinji Sōmai, and they both carry the bittersweet mood tag, and they sit in Drama territory. If that's the register that drew you to Kaza-hana, the second film will land in a comparable space — through a different lens.
bittersweet
What P. P. Rider is
Teenagers stumble into the seedy underbelly of yakuza antics with all the grace of a shopping cart with a wonky wheel. The class bully vanishes, prompting an investigation that’s equal parts half-baked cops and full-throttle gangsters. More chaotic than a karaoke night gone wrong.

