SPOILERS
In the beginning I could not wrap my mind around this rather unique film. Things just spiral off in weird dreamlike tangents. However, as you continue watching the story unfolds and you can't not fall in love with it. That is until Jack throws his key over the side of a cliff. The key that keeps his heart working! Just so he could kiss a girl. Which while a sweet gesture, was horrifying. Perhaps I should explain the storyline first. Jack has a clockwork heart obviously. One that can be easily overloaded if he feels emotions too strongly. He falls in love with a girl. Which is totally predictable outcome but hey. I won't give everything away so you'll have to watch the movie for the rest.
Still, it ends at the cliff scene so be warned. Normally, I would write off a story like this but the animators did a great job, the music was lovely, and the characters have really large vocabularies that they use to word thing in the most beautiful ways.