In the seventh year since the Gates of Hell opened, humanity across the various regions began to unite, and barriers of skin color and language gradually faded. People had never been so united as one, yet even that could not stop the demons' advance. After city after city fell, humanity's evacuation plan, the "Mobile Cities" project, was officially launched. At the same time, research began on the "Demon Eaters" project, humanity's plan for a counterattack.
That same year, as the Gate of Heaven opened, angels passed on their knowledge of fighting demons to the "Hunters," forcing the Demon Eaters project to be put on hold.
Just as things seemed to be looking up, the Gate of Purgatory opened, and the angels vanished without a trace. Humanity, plunged into despair once more, was reduced to struggling for survival. But a handful of Mobile Cities refused to give up and restarted the Demon Eaters project.
In the end, the only ones who can save humanity are humans themselves.
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