This was one of my 1st manga(I read from mangatoon), from as far as I remember girl(the fl) has a special blood which was not known but someone kind of important needed blood transfusion, so then you know what they did. And this "special blood" comes from a restricted island where people are very high intelligent. Then when the secret was out that fl was from that island she was taken back there, then they made her do so many military tests with another girl...
That's all I remember(ToT)(ToT)(ToT) Please help me find it, it's basically like a medicine to me( *´д)/(´д｀､)
did song lyrics stuck in head
