It's the new movie from the creator of Akira. It starts off well, but the end is a mess, and you lose interest about halfway through. It's pretty hard to explain what it's about, I'll let someone else try.
The first time I saw this it was in a Japanese cinema with English subtitles, so I didn't understand all of it. I just bought the DVD, and the movie makes a lot more sense now. I enjoyed it a lot more this time. The English dub is very, very good. The use of authentic accents is refreshing, and Anna Paquin does a surprisingly good job, even if her accent wanders around from time to time.