PC-88 FM synthesis doing Japanese supernatural horror and it sounds like the machine itself is possessed. Onryousenki on PC-8801 has this raw buzzing quality to every note that makes the horror themes cut deeper. "Old Pond" opens with this desolate atmosphere that the hardware renders in such a cold, metallic way.
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"Detective Murakami's Theme" stands out as this surprisingly melodic piece surrounded by dread. The two Arahaki themes carry the emotional weight of the whole score. "Infestation" pushes the sound chip into territory that genuinely sounds wrong in the best way.
There's also "Monochrome's Theme" sitting quietly in there. The PC-88 version hits different from the MSX2 one because the hardware gives everything a sharper, more brittle edge. Essential listening for retro Japanese horror fans.