Each episode focuses on a different person or group of people associated with the Little Slugger mystery, while two cops are on the case trying to figure out who the kid is and what his motives are, but things soon become more complicated. There's a big psychological element in the series, and there are times when you're not quite sure what's supposed to be real and what isn't. There is a trio of episodes around the middle of the series that can be described as filler, but it's worth pointing out that they are actually quite enjoyable filler, and the quality of the episodes is no worse than the rest of the series.
The animation in Paranoia Agent is excellent. There is great attention to detail and the backgrounds look superb. Some of the character designs are a little weird, notably a few of the male characters having large mouths and tiny eyes. As such they may not be to everyone's tastes, but it does make a refreshing change from the typical anime character design where almost everyone looks improbably good.
Susumu Hirasawa does a very good job in the music department. The opening theme is bizarre, but at the same time pretty good. Combined with images of the cast standing in random places, laughing maniacally for no apparent reason while some sort of apocalypse goes on behind them, makes for one of the oddest opening credits ever seen, but also one of the best. The ending theme is equally weird, but unfortunately just sounds rather annoying. The voice acting in both the Japanese and English dubs is very good, with the voices matching the characters quite well.
Paranoia Agent is not quite as good as it could be, but none of the problems are big enough to significantly hurt the series. The characters are interesting, the animation is stunning, the plot is deep, and all the twists and turns will keep you guessing until the (rather confusing) ending. The conclusion is a bit of a let down, but given the nature of the series it's not like it's a big surprise, and its still a decent episode in its own right. It's a testament to the writers that they can juggle science fiction, comedy, mystery and psychological drama, and do a surprisingly good job on all fronts. There are moments of violence, as well as the occasional themes of suicide and paedophilia, so this series may not be to everyone's tastes, but if you're into psychological series, Paranoia Agent is highly recommended.
