Guns and Different Worlds: Realms Behind the Gate

"Firearms and Fantasy" game worldview novel. At 0:17, a secret base on the Helan border suddenly lost control. Just when He Lan declared a "nuclear accident" to the outside world, the Donglu Army had forcibly taken over the scene. There is no out-of-control reactor underground, only a gray door of unknown origin. Behind the door are strange villages, kingdoms, magic, and an approaching army. For the first time, modern guns are aimed at a different world.