Kōhei Kadono (上遠野浩平 or Kouhei Kadono) is a Japanese author, best known for the Boogiepop series, which has also been adapted as a live action movie, manga and anime.
Heaps of fun. It definitely suffers from being a little too short, I would have wanted more of certain characters, but the central duo is a blast to follow, as is the rollercoaster of a plot. This would make for a great movie.