- The main horror gimmick. A young man's apologies are causing people's brains to leak out their faces before their entire bodies melt. And the sludge remains alive and conscious. Chizumi drinks it.
- One of the abilities of Yuuma's Satanic connection is the ability to disfigure women with compliments. We see two women suffer from this, and in the latter case, it goes beyond human in its extreme damage.
- Throughout the series, we have no idea which of the two kids is being truthful about their situations, if either are at all. Is Yuuma trapped in a horrifying situation that hurts others while his evil sister delights in it? Or is he sadistically spreading his curse intentionally while his sister serves as the unlikely voice of reason? These never become clear.
- Tomohito, the young boy Chizumi has a crush on, escapes the siblings, but is then found murdered with his throat slashed. Not only does the image of his dead body come abruptly, drawn in Ito's usual amount of detail, but the murder receives no explanation, is at odds with the siblings' typical methods and is a completely mundane event amidst all the surreal and bizarre horror, making it even more disturbing and frightening.
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