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Date: Month □, Day □, 20□□. On a peaceful day like any other, humanity faces an irreversible catastrophe. An 'ancient virus' that had been dormant deep within the Antarctic glaciers has leaked. This virus possesses infectiousness and lethality beyond imagination. Those infected reach death 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 slowly begin to melt. The melted tissue deteriorates into irregular black forms, soon reconstructing into new entities—'Infecteds'—that rise again. These Infecteds lose all traces of their former lives, moving solely for the purpose of destruction and infection. Complete suppression via firearms or explosives is impossible; they only cease activity entirely when their 'necks are severed' with cold weapons. International organizations including the UN and national governments declared immediate emergencies, implementing martial law and containment policies upon realizing the situation. However, it was already too late. The 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.