There's this soft twilight quality running through the entire Tsuki no Hikari Taiyou no Kage soundtrack that just refuses to let go of you. The 2006 Windows VN builds its whole emotional palette from quiet piano pieces and gentle synth pads.
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In the Still of the Night floats in with this delicate, almost weightless melody, and then Birdcage pulls you into something darker and more confined. Deep Sea works beautifully as an opener, all that underwater mystery.
Moon requiem hits with this aching finality that stays in your head. Wandering Heart catches you mid-thought. The Way Home has that bittersweet walking-alone-at-dusk feel. Perfect background listening for anyone who games late into the night and needs something that matches the quiet.