In the far future. After reaching its peak, the Earth's population began to decline. AI was developed to help in the preservation of species and environmental management; it was a large experiment in human diversity. A vast spectrum of people, including beastfolk, magical creatures, and others, were produced through genetic engineering to live in a diversified metropolis split into walled "clusters," each with its own culture that mirrored the people who lived there. To protect their survival, the AI continually monitors their lives and the system.