Jesus. I just... Goddamn. This is the pitch-black void of the entire manga that we're stepping onto. Inio Asano pulls no punches in displaying brutal, raw emotion out of the most disturbing parts of reality we'd rather not confront for ourselves.
It's terrifying, vile, disgusting, and even sometimes maudlin, but it's damned fucking real.
That's what makes this shit scarier than any horror/dark fantasy manga out there.
It's not a game.
This is real life.
And it sucks.
The second page of this manga says all you need to know about Punpun's psyche. His innocence is basically dripping from his eye sockets, and all he wishes to do at this point is to disappear from society with the person he believes he loves the most, the one who won't backstab him in the ass.