This show is kind of a strange case. It follows a singular plot, with reoccurring characters, but it all happens in episodic fragments. Most Anime will attempt to have a single plot point which is carried out by characters in a linear fashion, like a movie broken up into small bite sized pieces. Paranoia agent does not, it instead shows cases of individuals each episode having horrible and disturbed lives, or being perfectly normal. Some circumstances are hard to believe, and the ending in my opinion is quite weak, but i enjoyed the opening episodes much more than the rest of it.
Shonen bat is not an individual, he is simply a psychological effect. Everybody who was "attacked by Shonen bat was in fact a victim of their own desperate madness.
In the last episode when Maromi is gone and everything goes down the drain, the reason is that because so many people valued Maromi as a beacon of light and hope so to speak, more people became depressed. And in fact Maromi didn't just dissapear, but rather the new design Tsuki had to make did not come through, so everybody failed.
This show disguises the obvious insanity of its individual targets as well drawn, and exquisite personal pieces.
Another possibility is that everything that takes place is in Tsuki's head. When SPOILER tokyo is destroyed at the end by black sludge and grime, representative of Shonen Bat AKA Tsuki's unwillingness to take responsibility, everybody is dead. Everybody. But Tsuki is in the black slime and faces her fears and takes responsibility for the death of her dog, which leads to everything getting fixed.
I have no problems with this series, its a wonderful show that uses darkness to effective levels, without sacrificing the reality of its plot.....
although half the time it makes no sense.
8/10, watch it if you want an intellectual mind flaying.