If you loved Summer Days with Coo, try Crayon Shin-chan: A Storm-Invoking Jungle
A bridge between a film you've already seen and one most people haven't. Crayon Shin-chan: A Storm-Invoking Jungle has roughly 3.5× fewer votes than Summer Days with Coo — 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 Keiichi Hara, and they both carry the foreign gem mood tag, and they sit in Animation / Comedy territory. If that's the register that drew you to Summer Days with Coo, the second film will land in a comparable space — through a different lens.
What Crayon Shin-chan: A Storm-Invoking Jungle is
Packing for an Action Mask-themed cruise the Noharas barely avoid overpacking. While the adults vanish into monkey captivity the children discover their inner pirates. Meanwhile the monkeys keep insisting they were actually hiring.

