Raw, tense, psychologically heavy sound design. The 2011 euphoria theme song and BGM collection is the original release of this visual novel's soundtrack before the later remaster. "Rakuen no Tobira" anchors everything with its vocal hook, "Kyouki" (Madness) delivers exactly what the name promises, and "Sekiryou" (Loneliness) sits in a quiet, hollow space that gets under your skin.
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The romanized titles here map to the same emotional spectrum as the 2016 version. Dread, shock, cruelty, resolution. Fifteen BGM tracks plus the instrumental closer. Each one calibrated to a very specific mood. If you want to understand how a VN soundtrack builds atmosphere without relying on spectacle, start here.