Attack on Titan: Aboveground

A non-modern work, curious, human beings are "captive" by giants, but at the same time, from the perspective of humans, this is their defense. All humans in the world live within a circle of walls that are hundreds of meters high and several kilometers in radius. Outside, there is an endless vast world, empty and lonely. Standing on the wall, looking into the distance, there is no sign of life, as if the giant has never existed. Human beings have lived like this for many years, reproducing offspring, and endless life. Suddenly one day, the giant reappeared, breaking their tranquility. This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.