Korean animated sci-fi with a soundtrack that blends orchestral drama and delicate vocal work. Sky Blue, also known as Wonderful Days, has this post-apocalyptic atmosphere and the music nails it. Cheieui Theme opens with this sweeping main melody that immediately sets a melancholic tone for the whole film.
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Oodieui Harmonica strips everything down to just this raw, lonely instrument over silence, and it hits harder than any of the full arrangements. Then Aria floats in with vocals that feel suspended in midair. The fact that they included three different versions of the Wonderful Days theme shows how central that melody is.
If you're into anime film scores that carry real emotional gravity, this 2003 Korean gem delivers something most people missed entirely.