 If you liked
Alive: Saishuu Shinkateki Shounen
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 ...then you might like
Midori no Ou
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They are both science fiction where there comes something from outer space
Male protagonist and similar. Gets dragged into something bigger, than one might expect
The military is involved in a similar way, where there are times when they are against each other and other times where they work together
The situation gets bigger/better as the story goes on, but you might need a bit patience with Midori no Ou (Verdant lord)
They both have a great mystery behind
report
Recommended by Mingus2712