Eerie FM synth tones that sound like a haunted shrine talking to you through an MSX2. Onryousenki's soundtrack leans hard into Japanese horror with the hardware doing all the heavy lifting. "Ancient Miyadera City" has this unsettling melody that keeps resolving in the wrong places, and "Underworld" pushes the sound chip into genuinely creepy territory with layered dissonant voices.
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The "Arahaki" theme is the standout though. Something about that melody just sticks with you. "Before the Battle" shifts gears into this urgent pulse that the MSX2's FM synthesis makes sound rawer than it has any right to be.
If you dig retro horror games and want a soundtrack that actually commits to being unsettling, start here.