If you loved White-Collar Worker Kintaro, try Ninja Kids!!!
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 Takashi Miike, and they sit in Action / Drama territory. If that's the register that drew you to White-Collar Worker Kintaro, the second film will land in a comparable space — through a different lens.
What Ninja Kids!!! is
Apparently ninjas start young. Rantaro is sent to a ninja training school by his parents. It all builds up to a chaotic mountain bell race.
Ask 
ChatGPT
Claude
Grok
Le Chat
Perplexity
for a deeper bridge
ChatGPTClaudeGrokLe ChatPerplexity