For the Empire!

Not all wars are exposed to the sun. Li Shuo emerged from the underground mine tunnel with a depth of 300 meters, and his protective clothing was stained with the red gravel unique to the alien planet. He looked up at the sky - the outline of the huge planet called the "Broken Star" stretched across the sky like an eternal scar. This is "Twilight City", the last frontier fortress established by mankind in the "Kepler-186f" galaxy. Over the city, a huge energy barrier "star ring" circulates quietly, emitting a faint blue light. It is the last line of defense that isolates the empire's civilization from death.