Japanese vocal tracks layered over angel-themed visual novel drama. Angelium packed its 2003 soundtrack with both music and full drama CD segments, so you get scene-setting BGM and actual story content in one package. "舞い降りた天使達" (Descending Angels) opens with ceremony.
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"センサー発動！退避せよ" brings sudden urgency, alarm-mode energy. Then "わくわくデート" flips to pure excitement, date-scene giddiness. The vocal tracks "春色♥秋桜" and "裸の天使" each appear in multiple versions: full, karaoke, game-size. Four drama chapters close out the album, turning it into something between a soundtrack and an audio play.
If you want to experience a 2003 angel dating sim through your headphones alone, this gives you nearly the whole thing.