We live behind three walls that protect us from the creatures called Titans. They live everywhere else and exist only to eat humans. We lived for a hundred years in peace before they attacked us, breaching our walls and forcing us to retreat further into our sanctuary.
I grew up in a place called Shiganshina, which is just at the edge of the first wall, Wall Maria. Our village was the first to be destroyed by the Colossus Titan, nearly five years ago now. We lived in fear that it would happen again when we retreated behind Wall Rose.
My friend, Eren, lost someone very close to him that day. He...needed revenge, wanted it. So we joined the military, and trained, so that one day we might be able to reclaim our home.
We don't have anything like these...computers or even the lighting that you have. I feel that we did, at one point, though Armin's the one who could explain that differently. We have some things. We have guns, old guns used ages ago, and we have canons too.