 If you liked
Giniro no Kami no Agito
|
 ...then you might like
Ooyukiumi no Kaina
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In both, there is a boy and girl, one more close to nature than the other.
In both, the world is in crisis.
In both, there is an evil empire that want to monopolize all, with strange machinery.
In a sense, the vibe is really similar here, and there is a sense of discovery. And ofc, good music. Should really check this one if you liked Agito :)