 If you liked
Kaze no Tani no Nausicaä
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 ...then you might like
Kujira no Kora wa Sajou ni Utau
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While watching Children of the Whales, I really thought it felt similar to Nausicaa of the wind! Both anime are about a group of people who live peaceful lives in a “paradise” of sorts, where the world surrounding them is largely uninhabitable. However, their lives change when they come into contact with the outside world, including a more industrial country and battles.