Nightmare Fuel / Oceanfalls

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How distasteful.

• Nino's first encounter in the monster world is Five, a mere child, clawing her skin off. It's implied her transformation is so painful that she's trying to kill herself while she's still aware of what's happening to her.
• Five's description of the prince, a guy who wants fellow monsters to undergo horrific transformations, sounds dark.
• Nino's flashbacks to the war.
• Kotori's face after Nino almost cuts her arm off.
• Decimate. Needless to say, Corona is utterly terrifying.
• The Monster's ritual for sacrificing humans. Aria's description offers the lovely imagery of monsters cutting humans chests open, tearing out their hearts, and dumping their corpses into the Execution Cenote. It's also made clear that the humans are not allowed to die of shock, bloodloss, or anything other than the ripping out of the heart. It's no wonder that so many humans decided to kill themselves in prison before the ritual could happen to them.
• How does Suvillan punish Kotori for hiding the very human Aria? He orders Kotori to kill her with her bare hands, and then proceeds to make a not so subtle threat.
  Suvillan: Oh, and let me say. If the mosquito-like presence doesn't disappear when you kill that human... Well, let's just say.. You'll be more than a flightless little bird.
• Nino's flashback to his orphanage first seems colorful and peaceful, until two noblewomen start talking about how one of the orphans was found dead at the barrier. And then we see the corpse: covered in blood, with the symbol of monsters carved into her chest and the words "DON'T MESS WITH US" carved into her arms. It drives home how monsters hate humans so much they wouldn't hesitate even against an innocent child.
  • Also disturbing is the sheer apathy of which the two nobles talk about the incident, to the point that after one of them relays the full story, the other simply remarks "How distasteful."
• Shortly after Nino falls into the cavern, something hidden in darkness sneaks up on him in the water. When he turns around, it's not an enemy. It's his own mutilated corpse, and not only one of them. Thankfully, it turns out to be a bunch of illusions, but it's nonetheless horrific.