If you are familiar with Narutaru and Bokurano, then you would know that this mangaka is dark. Very dark.
The artwork of this mangaka is very unique, not especially pretty, but it is a very distinct art style that you can pick out from thousands of manga.
However unlike the other two works. the characters in this manga are devoid of any charms.
The main character of Narutaru was kind, charming in tomboyish way and very brave. The characters in bokurano are interesting. Very broken in some ways, but they are grounded and realistic. Their angers are believable. Their despairs and nihilism are logical.
in Nanika on the other hand, is ridiculous. When I was reading the series I could not help wondering if this is a gag manga. It's like reading a superhero comic where the main character is the "One punch man".
This is a noir manga with characters that would not make any sense anywhere but in gag manga. In a world where 4 really normal people suddenly decide that littering is a crime punishable with death, any resemblance to sympathy or empathy with any of the characters in the manga is impossible.
In the end the manga series is short. I am guessing it was cancelled.
It is as if the mangaka has built the entire series upon the idea of one plot twist related to the true nature of everyone's superpower, then added a heavy dose of self aggrandizing philosophy (which are fun to read on their own, but adds nothing to the plot, pacing or characterization).
In the end, it was easy, quick read, just like Narutaru and Bokurano.
If you like non standard, really weird noir, which does not depend on shock factor or gore (like most of the "death game" manga recently), this is actually one decent "thinking person's manga".
It is too bad that none of the characters in the series are capable of thinking apparently. This is more of a gag manga on the absurdity of society , but sadly the author think that he was writing a drama not realizing that the joke is on himself.