In 2265, the ground has long been abandoned, and humans have become accustomed to life in a fortress in the sea.
On the way home from school, ordinary high school student Chen Zhihan was kidnapped. His parents are dead and he doesn't know any rich people. He thinks the kidnappers kidnapped the wrong person.
In order to prevent the kidnappers from tearing him apart, he decided to save himself.
What Chen Zhihan didn't expect was that he actually escaped to the ground.
Contrary to what the Alliance claimed, although the ground was lifeless, there were still people living on it. Different from the comfortable but monotonous life in the sea, people on the ground are always ready to fight monsters and occasionally search for relics of the old world. But the strange thing is that they actually know nothing about the sea fortress.
At the same time, undercurrents of various forces in the sea are surging. Maybe, Chen Zhihan's kidnapping was not an accident?
The Lord of the Black Umbrella District acts ruthlessly as the incarnation of justice, the senior management of Crescent Company uses all means to protect themselves, the attitude of the new leader of the School of the Past is ambiguous, and the goal of the Icarus Organization is still a mystery.
There is only a thin line between the ground and the sea, but fate seems to be divided.
But maybe the two sides of this line are actually intertwined with each other, and what will be the fate of everyone involved?
Intention: Fight hard, for yourself.