[TOMT] [MOVIE] An animated film where a large whale appears from below the characters and swallows them.

There was a post on r/thalassophobia a while back that had a trailer for this movie. It was definitely a Japanese movie, and when I watched the trailer, it didn't seem like it was going to be released in the west.

The whale scene also had lots of bioluminescent stuff on the water. It looked gorgeous, and I haven't been able to find it anywhere, I damn near looked through every r/thalassophobia post.