If you loved Rich in Love, try Kaguya-sama: Love Is War -The First Kiss That Never Ends-
A bridge between a film you've already seen and one most people haven't. Kaguya-sama: Love Is War -The First Kiss That Never Ends- has roughly 6.8× fewer votes than Rich in Love — 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.

Rich in Love

Kaguya-sama: Love Is War -The First Kiss That Never Ends-
What they share
Theyboth carry the bittersweet, foreign gem, playful, tender mood tags, and they sit in Comedy / Romance territory. If that's the register that drew you to Rich in Love, the second film will land in a comparable space — through a different lens.
What Kaguya-sama: Love Is War -The First Kiss That Never Ends- is
The nation’s smartest teens finally seal their long-telegraphed devotion. Their first kiss arrives with the crushing realization that they’ve spent all this time strategizing rather than being honest. It’s adorable, then instantly awkward.