There is an unknown human-engulfing alien called Amazon in a city. Their number has reached 4000. The culprit who created this monster is Nozumi Pharmaceutical Company! Command under the name of the wild seat between the Peston Service removal class secretly deal with "Amazon". It is under such circumstances that Shuizawa, a young man who lives smoothly without going out in a clean house, and Yingshanren, a wild man who lives like a wild animal, only rely on wild intuition and combat effectiveness, and gradually understand the story of survival in the fierce survival struggle of "Amazons".
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