 If you liked
Qualidea Code
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 ...then you might like
Darling in the FranXX
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Both series treats about a group of youngsters in what seems to be a post-apocaliptic world who have to deal with weird, monstrous aliens in a society ruled by mysterious adults, where they are the only ones who can stop the menace. These teenagers are also paired in groups of two, with the difference being that in Qualidea Code, the couple leads an squad, while in FranXX, the duo pilots mechas.
I dont't know if people have noticed it but there plot follows somewhat on the same path. Some children are raised by unknown people and made to fight unknown beings not knowing the real objective and purpose behind it. They wonder why they live in isolation and why outside is dangerous.