Funouhan (Impossibility Defense) is a misunderstood misanthropic manga. Such a negative position is understandably not going to sit well with everyone, and so attempting to read it with a conflicting mindset will more or less remove it's primary appeal. That being of an ideological venting fantasy.
The main character is not so much a character as he is an allegory. He works in the guise of a contract killer, it allows him to fulfill his actual goal. To playfully criticize, punish and judge humans. With that you could say his true nature is that of a morality judge or death judge.
No matter, it is as he puts it. A reflection. The characters in each episode have their deepest darknesses drawn out from within using his schemes. And then, punished. This is where the manga's biggest strengths and weaknesses lie. It just isn't good at being an objective analysis of the human condition. It glorifies and purposefully showcases people at their worst and weakest to generate cathartic release.
The format it uses depends on it, and if you at any point found it repetitive. You weren't paying attention to the right things.
Every other aspect is done well just about enough, that I can firmly say this is one of the most solidly executed adult manga I ever read.
It's cynical, it's dark, it's harsh. And if you ask me, handles this far better than another manga I read. Brutal: Confessions of a Homicide Investigator
Both are in the same format, yet totally different approaches. Brutal doesn't deserve as many free passes due to it lacking the supernatural to hide behind and unbiased treatments. Everything that happens in Brutal operates under a strict belief system with little room for deviation. So you'll struggle a lot more at finding the character's actions ethically permissible, if at all depending where you stand. On the other hand, Funouhan has a grey area that at least tries to highlight the fallible and naive, present all around us. (I can sympathize and admire this.)
