Two vocal tracks up front, then a full stack of mood-setting BGM that's way more varied than you'd expect. The opening song "X-ray" comes in multiple versions including a short cut and instrumental, and it's catchy enough to warrant the treatment.
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"日常" (Daily Life) tracks numbered one through five map out the full arc of a school day, from morning brightness to moonlit evenings. "朱夏、旺盛に享楽せよ" (Midsummer, Indulge Vigorously) has this energetic summer festival feel. Then "魔の通り道" (Path of the Demon) drops the temperature completely.
Character themes for Ryushii, Shin'ai, and the rest give each route its own sonic identity. The shift from carefree to ominous tracks hits without warning. If you like VN soundtracks that actually bother building atmosphere across thirty-plus tracks, this one puts in the work.