Gentle character themes that suddenly give way to tracks called "corpse" and "murderer" and yes it's exactly that kind of VN. Sakura no Mori Dreamers' 2016 soundtrack sets up this peaceful sakura-tinted atmosphere before pulling the rug completely.
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Madoka's theme has this delicate piano melody that becomes almost painful once you know the story context. "Ghost is approaching fast" does exactly what the title promises with these urgent, staccato patterns that genuinely unsettle.
"アンニュイの森" sits in this hazy, melancholic space between the calm and the chaos. The way it ends on "Corundum" with something harder and more resolved than anything before it. If you want a VN soundtrack that actually earns its tonal shifts instead of just having them, this is the one to start with.