Cold, unsettling PS1 synth that creeps under your skin immediately. Gakkou de Atta Kowai Hanashi S is a 1996 PlayStation horror anthology, and this "Original Sound Horror" soundtrack earns that name completely. "降臨" (Descension) sets the dread early with tones that feel like something watching you from a dark hallway.
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"狂乱" (Frenzy) is pure panic fuel, the kind of track that makes you want to put the controller down. And "三途ノ川" (River Styx) goes full otherworldly with this hollow, distant atmosphere that sounds like crossing over to somewhere you shouldn't be.
The whole thing runs through 49 tracks of escalating unease. PS1-era sound hardware giving that grainy, lo-fi quality that honestly makes it creepier. For horror fans who think modern game soundtracks are too polished to be actually scary.