 If you liked
Qko-chan
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 ...then you might like
Shinseiki Evangelion
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Both are about an ongoing war againts Aliens.
Children piloting mechs to fight Aliens, Similar premise and location setting (both are set in an city at the near future),the military are creating plans to fight off the Aliens ("Angels" in Evangelion),Adults showing no mercy to children.
Evangelion and Qko chan both also has an coming of an age theme, but Qko chan doesn't have unnecessary religious symbolisms like Evangelion did