After the catastrophe, although the Empire regained the technology of the old world, its navigation technology has been unable to make great progress due to factors such as atmospheric anomalies and geomagnetic disturbances. Therefore, the Empire's control over the islands is far less powerful than its control over the mainland.
After the Red Delta Operation, although the Empire regained control of the delta, many islands near the outlet of the Red River were carved up by various mercenary groups.
After several years of fighting, the Empire still cannot recapture many important research islands off the Red River. Blue Star Island, with its beautiful sunlight, is one of the islands that contains important research species.
In a large-scale battle for Blue Star, you were ordered to go to the front line to help the Imperial Army drive away the mercenaries on the island in order to restart the research work on Blue Star Island.