• Doomsday Laboratory: A-23, a virus secretly developed by the military, is accidentally leaked, creating a quarantine zone with a radius of ten kilometers. The test subjects evolve by devouring genes, eventually giving rise to a perfect evolved being that retains human intelligence.
• Temporal Rift: On every full-moon night, portals appear, leading to different points in time and space. Completing missions earns gene fragments. Collect enough fragments to unlock the ultimate secret of the zombie virus.
• Fragments of Memory: When the protagonist awakens in a morgue, he retains hazy memories of a laboratory. These fragments gradually become clearer as he evolves, guiding him in his search for the truth.
