"Doomsday: Online Games: Unlimited Explosive Soldier Overlord" was a novel about the end of the world between games. The concept of dimensional invasion was also reflected in it. There was also a doomsday novel called "A Sun God's Simulation of Star Creation", which also involved dimensional invasions. If you are interested in this type of novel, you can try reading these two novels. I hope you like my recommendation. Muah ~