Apocalypse of Natural Enemies

The world is in crisis, and human beings are under huge threats. Human beings in crisis want to change the status quo, and they have come up with the idea of ​​summoning humans from other worlds to help them. The summons resonated with each other, merging countless worlds together. However, just as drawing on a rotten apple will lead to another rotten apple, a world where humans are in danger can only summon another world where humans are in danger! In the world of swords and magic, the Demon King dominates everything, and nineteen demons will dominate one side. In the future world, AI rebels, Iron Man is out of control, and the out-of-control robots want to clean up all humans. In the primitive world, violent giants wreaked havoc on the land, and humans fled in all directions. In the heroic world, there are more and more weird people emerging in an endless stream, becoming stronger and stronger, as if they are going to crush everything. In the world of ghost stories, there are terrifying balloons floating in the sky, fish with human characteristics, women with swirls on their faces, more and more supernatural phenomena and unspeakable monsters appear in that world... And even humans don't seem to be that simple!