More than three hundred years ago, in 2350, the earth has become a wasteland. Technology has regressed, the population has dropped sharply, there is acid rain in the sky, and nuclear sewage on the ground.
There are also monthly animal tides, making human survival increasingly difficult. Shihan was born in a military industrial base. When he was about to develop a geomagnetic gravity aggregation device, alien civilization came again...unify mankind and rush out of the solar system...