Judges serve as messengers for the Central Government, dispatched to punish delinquent cities. They possess the ability to control programmed "seeds," triggering explosive growth. Following an outbreak of disease among the "Children of Babel," Central, which grants power to Judges through its research, requires data from a natural Judge like Sion. However, Central is also interested in the legend of the "Heavenly City," for which Sion is named; what could their true purpose be?