[Dystopian] [Dark Humor] [Humanoid Monsters] Zero is an enforcer among humans, spending her days on the border killing monsters and eating them in a dull routine. Then one day, she finally meets someone like herself, and together they return to humanity's last settlement: the Nest. But why do they have to pay a survival fee? Lin Wan, an ordinary second-year science student, is forced to join an expedition team venturing beyond the borders for 250 credits. The team is nearly wiped out by a Class B monster. Just as her head is about to be pierced, the Class B monster is torn apart by a more powerful humanoid monster using its tentacles. This humanoid monster seems to think it's human. And an enforcer, no less? ...Nest Eleven [Nest of Order] is a place where money is everything, discrimination is commonplace, and you have to pay just to stay alive. Here, any illegal act can be made possible by obtaining the proper legal permit. The morality of the past has long since been thrown into history's trash bin. Selfishness, greed, and cruelty have become the norm. The people at the bottom either put their family up as collateral and sell away their future to scrape together tuition for the exams, or rely on transformations into unknown aberrant beings, blood-and-flesh sorcery, the gaze of demigods... to increase their strength and become powerful enforcers.