The Giant Pot Syndrome of the Nanguo Kingdom

Beside a sprawling metropolis lies a tiny kingdom, less than a tenth of its size. Though small, it still calls itself a "kingdom." Yet the residents of this so-called kingdom all seem to have contracted a strange illness. To investigate, scientists have developed pot-shaped hats that measure the residents' various stress indicators. A first-year middle school student noticed something was wrong early on, but he never expected to fall victim to it himself in the end.