 If you liked
Giniro no Kami no Agito
|
 ...then you might like
Green Legend Ran
|
I'm surprised no one's made this recommendation yet, honestly. The stories in the two series are somewhat similar, a post-apocalyptic future where with a lot of desert environment. Except in Origin it was a man made disaster, and in Green Legend Ran it had to do with aliens descending onto the planet. There's a lot of similarities, like with nature being aggressive and fighting back, sometimes through the bodies of hosts, people with silver hair being special, and of course that a normal kid finds a girl who's on a journey.