A sudden abnormal attack by a Stage Four gasterea with a unique ability leads to the “poisoning” of one of the monoliths that protect the Tokyo Zone. Now its residents have only a few days before the protection collapses, and then an endless horde of mutated monsters will rush into the gap. Of course, you can replace it. But the monoliths are enormous—it takes time. And to win that time will be necessary for both regular troops and the forces of civil defense agencies’ workers…