This movie is just pure love. It shows the very pinnacle of feelings and emotions and it does so in an unbelievably good way. It's old-school in a very good way. Attention to detail, animations, sound, composition, story, characters and everything else is top of the top. And it's not too old-school, so the art style doesn't look aged, the opposite of that, even nowadays it looks much better than anything modern. The story is "aww", the scenes are "wow" and the movie overall is "aaa". You can feel how important and well thought every small detail is. And, like a good old school anime, it starts easy to not overwhelm youand it goes grand and beyond.

I don't rate a title 10/10 unless it is an actual masterpiece.
This one is and it is about love.