Quiet shamisen plucks dissolving into something that makes you hold your breath. Inunaki is a Japanese horror game on PC that pulls its atmosphere almost entirely from this soundtrack. Tracks like "夜の女王" build with this creeping traditional instrumentation that just sits wrong in your stomach, while "顕現" drops you into pure dread.
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Then "真砂音頭" hits with festival music that should feel cheerful but absolutely does not. The way this OST swings between calm pastoral stuff like "穏やかな野道" and total darkness is what gets you. It sounds like a cursed village festival recording.
If you want horror music that works without a single jumpscare sound effect, this is your late night listen.