- The sex scene in chapter 36 is... rather disturbing to look at. What the characters are saying doesn't do much to lighten it up, either.
- What Punpun looks like when he snaps in volume 9. He becomes this black mass with too many eyes, and tends to spout lots of nihilistic quotes whenever he's depicted like this.
- It gets worse in volume 11, after he kills Aiko's mother, when the latter tried to stab Aiko, and in volume 12, when he beats someone up for criticizing Sachi's manga (among other things), and later tries to kill Aiko, and then himself, in absolute grief over his murder.
- And then we get this frame◊ as Punpun beats up the guy in volume 12.
- For readers who are still coming of age, the extent to which characters fail at life whether in academics, employment, or generally may constitute an existential form of Nightmare Fuel.
Nightmare Fuel / Goodnight Punpun