 If you liked
Ergo Proxy
|
 ...then you might like
Kujira no Kora wa Sajou ni Utau
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Both anime transports the viewer to a colorful and breathtaking world completely different than our own. In both anime, the setting is absolutely incredible and beautiful, but have dark undertones and tragic moments. Everything isn't as colorful as the backgrounds. Humanity has an extremely drastically low population and is close to completely dying out.
For the main characters, both shows have young adolescent boys that are interested in history (one boy preserves history while the other searches for artifacts and stories of the past) and want to find other humans. The boys both are connected to mysterious girls that bring major change.