Soft synth pads folding into vocals that carry more weight than they let on. Kono Sora ga Tsuieru Shunkan ni is a 2003 PC visual novel, and this music disc packs 22 tracks including multiple versions of the vocal themes.
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"Calm" and "An Ordinary Day" build the slice-of-life baseline, warm and unhurried. Then "Singing of the Dark" and "A feeling of nothingness" shift into something colder, pulling you toward the title's promise of a collapsing sky.
"At the Moment the Sky Collapses" delivers on that tension directly. "Sky" and "Heat Haze ~Kagerou~" each get full, compact, and karaoke edits, which tells you how much the vocal tracks mattered. If you're into early 2000s PC VN soundtracks that know how to build dread under everyday warmth, this one does it quietly and well.