 If you liked
Giniro no Kami no Agito
|
 ...then you might like
Ibara no Ou
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There are similar themes of nature taking over, although for different causes and reasons. The main characters in both films also strike a few similarities: one being that they suddenly find themselves involved in a situation seemingly beyond their control and that they both have someone very close to them, someone they would go to the ends of the earth for.
Both stories are set in a post-apocalyptic world and deal with nature, mystery and "tree-people".