Thirteen numbered BGM tracks and a vocal theme called "heart beat" that carries the whole release. Natsudoki Harem's Return Disk soundtrack is minimal but works within its scope as a late-2000s Windows VN. The BGM tracks cycle through standard visual novel moods, from cheerful daily life pieces to more tense or romantic moments, all with that clean MIDI-adjacent production typical of the era.
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"heart beat" as the vocal track is catchy with a driving beat and layered synths that feel very 2009 J-pop. The off-vocal version actually reveals some nice instrumental details buried under the vocals. Nothing groundbreaking but it's honest.
If you're into collecting smaller VN soundtracks from this era, it's a neat little time capsule of late Heisei PC game audio.