 If you liked
Aegis
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 ...then you might like
Owari no Seraph
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Attention this might contain minor spoiler. You love sci-fi shonen with "very close friends"? Aegis could be considered a sort of Owari no Seraph Korean version. You have orphan children forced to fight for a goal, two best friends who end up in different sides of a war, the blonde one making everything alone within his reach for the dark-haired one to live (and make friends), even if it means to sacrifice himself to achieve that...in whatever means.
You will be heart broken with the story of these friends, set in a futuristic/dystopian world. Personally I love ONS more but Aegis is really good and
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