Okay it went like this:

I was watching some anime movie about Cardcaptor Sakura, and by that I don't mean in a cinema I mean literally be personally present in the movie universe itself. Anyway she was trying to retrieve something from a magic boat but then this witch that looked like the one from Howl's Moving Castle intercepted her, then this prince-like guy showed up and aided Sakura in fending the witch off. He tells her that even though she got away she'll be defeated by someone else. Then he reminds her "Don't you have something to retrieve?" So Sakura immediately flies back to where she was trying to retrieve the item from the boat. She was flying in a starry night sky with ruins. Then she cries "CELESTIAL DIVE" as she dived down. Upon arriving, she sees the ship almost out of sight and catches up, then some baddies start throwing potatoes and radishes at her, but still successfully retrieves the item on the boat: A magic violin. She starts playing it and a lot of magical stuff happen everywhere and those baddies get disintegrated...and that's about it. Some of the details here are just made up, I don't remember all of it.