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May'n - Graphite_diamond (TV Version) Azur Lane The theme song

The blue line with blessing --
"Blue line" girls, mysterious enemy rout of the invasion from the outside world "sirens" offensive.
Never change, however, struggle for the generations to come.
Just like human ever take Marine hegemony, due to the great differences in the concept of "blue line" and "red" axis into opposing camps.
After that, as time goes by --