The multinational pharmaceutical company "Black Moon" secretly developed biochemical weapons. The RNA virus code-named "Ouroboros" leaked from the laboratory. The infected people's pupils showed snake-like vertical pupils, their blood was fluorescent green, and they had the collective wisdom of collective hunting. On the seventh day after the virus outbreak, 90% of the world's population was infected, and the civilized order completely collapsed. There was a 0.01% Chance among the survivors to awaken the "virus adapter" physique, and they could gain evolution points by killing zombies.
The protagonist discovers a mysterious connection between the virus outbreak and the "Children's Cognitive Enhancement Program" he participated in during his childhood.
