After the last war, the old era did not crash down, but quietly extinguished itself over long years—people call it the Silence. Three hundred years later, the wasteland is filled with pollution beasts that devour everything. Shi Ying, a lone female hunter, takes on a grade-B escort mission, but mistakenly awakens a giant pollution beast that had been asleep for fifteen years in the wreckage zone. That thing once leveled an entire city overnight, and it is still growing. The mission skyrockets from B to SSS, but what truly silences the guild is not the monster—it is when Shi Ying raises her gun, another consciousness flashes in her pupils. Who are you? I don't remember.