The Nightmare 2011 Mix that opens this thing immediately sets the tone and it's unsettling in the best possible way. Shin Kamaitachi no Yoru, the eleventh suspect edition, is a sound novel mystery and the soundtrack builds dread like nobody's business.
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"Suspicion" and "Tension" and "Uneasiness" are all separate tracks and they each find completely different ways to make you nervous. "Pension Brownie" has this deceptively cozy melody for the lodge setting that makes the horror tracks hit harder by contrast.
Then "Code Name Kamaitachi" drops in with urgent strings and percussion when things go sideways. The comical panic tracks are a wild mood shift though. If you love mystery VNs where the music is half the tension, this soundtrack does so much heavy lifting.