Two tracks. That's it. This is a drama CD rather than a traditional soundtrack, so you're getting voiced narrative content from a mid-2000s Windows visual novel. The audio sits somewhere between radio play and game cutscene, with voice acting carrying the emotional weight over minimal musical backing.
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Without more tracks to build a picture, what you get is a focused snapshot of the game's tone, intimate and confined, which fits the "narrow sky" in the title almost too well. The 2007 PC VN scene produced tons of these companion drama discs, and they live in this odd space between game and audio fiction.
If you're curious about how visual novels extended their stories beyond the screen, this is a pure example.