One track. That's it. "Rival of Destiny" is the sole piece on this drama CD release tied to the gothic vampire visual novel Princess Nightmare. It's a character-driven audio drama disc rather than a traditional soundtrack, with this single musical piece anchoring the whole production.
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The PS2/Windows VN itself had a darker, more theatrical sound palette (vampires, gothic school settings, rival factions), and this track carries that energy. It exists in that very specific mid-2000s otome game space where drama CDs were as important as the games themselves.
Completionist territory, honestly. But if you're deep into Princess Nightmare's world and want every piece of official audio, this is the one you're missing.