Over fifty mood-coded BGM tracks that read like an emotional index for an entire visual novel. The Natsuzora no Perseus instrumental collection names its tracks after raw feelings and it works. "sleepy" does exactly that with slow, drifting tones.
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"vigor" snaps you awake with brighter tempo and energy. "suspicious" and "frightened" pull into darker territory with minor keys and tension that contrasts sharply against the warmer daytime pieces. The character themes for Ren, Sui, Ayame, and Tohka each carry distinct personalities through their arrangements.
"fantasia" stands out with something more elaborate and layered than the rest. The instrumental versions of the vocal tracks round things out nicely. If you played through Natsuzora no Perseus and want to relive every scene's emotional beat, this collection is basically a complete mood board in audio form.