Dark, moonlit vocal tracks that sound like someone singing at the edge of a gothic cathedral at midnight. 月供調 [gIg+] is a 2008 Windows doujin release with four vocal songs plus their karaoke versions, and every single one revolves around the moon.
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"紅い月、夜を想う" (Red Moon, Thinking of Night) opens with this rich, dramatic vocal performance that sets the whole nocturnal mood. "月は無慈悲な白き玉座" references the moon as a merciless white throne, and the music matches that severity.
"D_Side of the Moon" goes even further into esoteric territory with its Omega blessing imagery. The karaoke versions actually reveal how layered the instrumentals are underneath. If you collect doujin vocal albums and want something that commits fully to a lunar gothic aesthetic, all four tracks deliver.