Apocalypse, A Journey of NTRS with My Sister

【Apocalypse·in*est·NTR】This world is already doomed. Humanity was invaded by a special virus that destroyed order within just one month. Another month wiped out human , and the final month eradicated all remaining human factions. Now, hardly anyone is left. At least, from what I know, the world no longer seems fit for human survival. What kind of virus could be so terrifying? It’s a virus that turns humans into monsters and evolves endlessly… Perhaps it’s not even a virus, but some extraterrestrial organism from the cosmos—no one knows. It sounds eerily similar to the zombie viruses from old movies, but it’s clearly far more horrifying.