Terror In The Isekai-Verse.

Across the marble universes, there lived many Isekai worlds of centered characters. Whether they were Isekai'd from reincarnation, divine act, summoning, reverse, specific tool, pulled into game, struck by gods, you name it. However, upon one of these worlds, the mysterious unidentified black blood has begun to plague unsuspected life of planets one at a time. Not only that, but the monsters from the black blood went in to kill all of the entire populated planets. Including every chosen Isekai warriors of heroes and villains. In every plagued world, there were sightings of one group responsible for the massacre of kingdoms and species. How did this happened, you may be asking to yourself? Why is every world plagued? Can every united Isekai heroes and villains survive against this certain evil or will every world fall for good? Well, let's dive right into the story as we take a look into one of the Isekai planets and where the plague has started.