This one opens like someone cracked a door into a room where time just stopped. Yumahorome's soundtrack leans into this unsettling quiet that keeps folding in on itself. "静寂の扉" (Door of Silence) sets it up with vocals that float over this barely-there arrangement, and the off vocal version strips it down even further into pure atmosphere.
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"震騷" hits different though, all tension and trembling energy like the walls are breathing. Then you get "心臓" (Heart) which is just... raw. The way the tracklist mirrors itself with kanji and hiragana versions of the same titles tells you this whole score is about duality and reflection.
If you like mystery VNs where the music makes you hold your breath, this belongs in your rotation.