A Fantasy World Expansion Plan!

In 2222, Blue Star's energy was almost exhausted, a large number of factories were shut down, and technology stopped developing. However, Yang Dong, an ordinary reserve force of the Blue Star Alliance, discovered that he could open a portal to another world. The energy density of the magic mine in the other world is more than ten times that of uranium-235! There is a vast unpolluted grassy sky in another world! There are countless elf girls and cat-eared girls in another world! Similarly, the other world is also full of dangers...