If you loved The Life of Budori Gusuko, try The Tale of Genji
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 Gisaburō Sugii, and they both carry the bittersweet mood tag, and they sit in Animation / Drama territory. If that's the register that drew you to The Life of Budori Gusuko, the second film will land in a comparable space — through a different lens.
bittersweet
What The Tale of Genji is
Here's one for the high-culture crowd. A prince cannot control himself, and begins an affair with his father's wife. This sets him off on a lifetime of searching for fulfillment in the arms of other women. It probably looked amazing at the time.
Ask 
ChatGPT
Claude
Grok
Le Chat
Perplexity
for a deeper bridge
ChatGPTClaudeGrokLe ChatPerplexity