If you liked
Jinrui wa Suitai Shimashita
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...then you might like
Escha & Logy no Atelier: Tasogare no Sora no Renkinjutsushi
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Humanity is dwindling and is in desperate need of resources in order to survive in both series. The setting is very similar and and both hold secrets and mysterious places. They both have girls with pink hair and green eyes as the main protagonists who are employed in a position that plays a vital role to the functioning of their town.