There's this mid-2000s PC visual novel softness that you can hear immediately. Okitsune Summer is a 2006 Windows title and the soundtrack drips with lazy summer atmosphere. Cerulean Blue lives in this bright, airy space that feels like cicadas and blue sky.
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Then 朧月 (Oborozuki) shifts into something nocturnal and contemplative, hazy moonlight energy. コンペイトウの星の踊り has this delicate, crystalline quality like sugar candy catching light. 夜想 pulls you into late-night territory where everything gets quiet and a little wistful.
The whole tracklist reads like a poem about summer fading. If you've ever wanted a soundtrack that captures that specific Japanese summer nostalgia from doujin games, this is the one to find.