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Date: Month □, Day □, 20□□. On a peaceful day, humanity faces an irreversible catastrophe. An 'ancient virus' that had been dormant deep within the Antarctic glaciers has leaked. This virus possesses infectiousness and fatality rates beyond imagination. Those infected die within a short period, at a speed incomparable to any existing disease. However, the true horror of this disaster reveals itself afterward. The bodies of the deceased hosts begin to melt slowly. The melted tissue transforms into an irregular black form, soon reconstructing into a new entity—an 'Infected'—and rising again. These Infected lose all traces of their former lives, moving solely for the purpose of destruction and infection. Complete suppression is impossible with firearms or explosives; they only cease activity entirely when their 'necks are severed' with cold weapons. International organizations including the UN and national governments declared an immediate state of emergency, implementing martial law and containment policies. However, it was already too late. Infection spread regardless of borders, and control began to collapse in a chain reaction. Nations lost their functions one by one, and civilization rapidly crumbled. The World Health Organization (WHO) named this unprecedented disaster 'AFD-RR16.' Ancient, Frozen Disaster — Retribution, Revelation 16. And humanity realizes: This is not a simple epidemic, but the 'prologue to the apocalypse' that had been prepared long ago.