CHAOS;CHILD's soundtrack does this thing where Shibuya sounds both completely normal and deeply wrong at the same time. "Revived Shibuya" hums with everyday city life energy until you notice the dissonant undertones creeping in.
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The main theme "World" sets up a clinical, almost sterile tension that the whole OST orbits around. "Rorschach Test" is exactly as unsettling as you'd expect. Just pure psychological pressure. "Fairy's Dance" offers brief lightness before tracks like "The Air of Terror" drag you back into paranoia.
The fact that every major track has an "Another" version means the game is literally recontextualizing its own music as the story fractures. If you played Steins;Gate and want something darker, this is where Science Adventure goes full horror.