If you loved Children of the Sea, try Doraemon: Nobita and the Green Giant Legend
A bridge between a film you've already seen and one most people haven't. Doraemon: Nobita and the Green Giant Legend has roughly 7.3× fewer votes than Children of the Sea — 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 Ayumu Watanabe, and they sit in Adventure / Animation / Fantasy territory. If that's the register that drew you to Children of the Sea, the second film will land in a comparable space — through a different lens.
What Doraemon: Nobita and the Green Giant Legend is
Here's a film that certainly makes some choices. Aided by Doraemon's gadgets, Nobita's new plant-based pal becomes humanity's unlikely advocate when tree-like aliens arrive to assess Earth. It's probably someone's favorite movie.

