Boogiepop Phantom is an anime that focuses almost entirely on the dark side of human nature. Now, this can be a complete turnoff if you get sick of the same depressed high school kids and extremely dark areas episode after episode. Until the last episode, pretty much the only colors you'll see are orange(the sky), red (blood), and black (I know it's a shade, not a color). With this anime being made in 2000, the older animation combined with these colors is not exactly a great level of animation. However, for the mood, the animation works very well. Everything seems blurry and washed out, and it works wonders with the depressed characters ans settings.
The sound is worth noting; the background music is often effective and fitting. Strangely enough, this doesn't apply to the opening and the ending. The opening is one of my personal favorites, and the ending is decent, but neither fits the mood well. The sub is good, but just good. The dub is hit or miss; some characters are great, others are bland as cardboard.
The absolute best thing about this anime is the story. The story is one gigantic puzzle, with the pieces very much mixed together. There is no main character to follow, there is no chronological order, and many scenes have some hidden meaning that adds to the story or side stories. This is possibly the most ambitious and confusing story I've seen so far in anime, and it is only 12 episodes long. It is filled with dark themes of death, depression, anger, jealousy, regret, etc. Although the whole anime seems rather awkward in terms of character interaction and horror parts, it still works for me because of the extremely detailed story and many themes. And although it may be difficult to understand, it's certainly not because of random mindfucks that one might call (oh boy, the most used word on the internet) pretentious. After watching and re-watching and paying close attention, the story is pieced together. Most of what you see is important, as mentioned earlier, to the main story or the side stories that make up the main story, so it's certainly not meandering around and throwing out said pretentious introspections. There are a few quotes from other media, such as Heart of Darkness and Gravity's Rainbow, but they are not overwhelming and don't take away from the anime's individuality. Actually, this anime somewhat reminds me of Heart of Darkness. I don't really equate it to such a literary masterpiece as Conrad's work, but Heart of Darkness is described as being less of a reading experience and more of walking into a nightmare, and that is kind of the same feeling that I got from this anime.
Because, as mentioned earlier, there is no main character, the majority of the characters are only part of the current side story, and are not developed very well. Overall, this is probably the worst part of the anime, and many of the characters are quite forgettable. And oddly enough, this seems to actually fit into the anime's message about the dark side of humanity. Most of the people I meet are certainly forgettable, and that is what this anime reminds me of. I did like the characters with reccurring appearances though, such as Toka Miyashita, Nagi Kirima, and, of course, Boogiepop.
All in all, this has become one of my favorite animes after watching it 4 times over. I would highly recommend it.