For a lighthearted anime movie, it has one of the most mature love story. I don't mean just romantic love, but also platonic love as well. How the weight of the feeling between friends, despite differences and argument, can still be overcome if you're willing to talk. Which is why it's so apt to have this movie main theme be 'communication'. The side love story was sacrificed of its depth because there's little screen time to show case it, but otherwise this is a movie well spent to watch.