 If you liked
Freedom
|
 ...then you might like
Suisei no Gargantia
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Protagonists from space have been told lies by their government about the planet Earth and the fate of humanity there; they travel to Earth and find humans living cosily in the post-apocalyptic Earth. Some cultural clashes ensue; moreso in Gargantia since Ledo is a soldier whereas Takeru and his friends are underground racers.
Both involve molluscs.
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Recommended by Fortress_Maximus
Both series explore a similar concept of a post-apocalyptic crisis warranting Earth uninhabitable, and the surviving humans seek a new home in outer space. Both series' viewpoints are from a space-dweller's whose whole perception of Earth is grounded on the fact that it is uninhabitable, and the protagonist discovering that there is more to Earth and life on Earth than what the upper echelons of authority in their society suggest. They also share the visual dichotomy between the environments and inhabitants of Earth and the metallic confinement of outer space and their respective inhabitants.