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Catto City is a technologically advanced, sprawling urban environment that serves as the primary setting. It is a metropolis where humans and a distinct species of cat-like humanoids, known as "Felinians," coexist.1 The city's architecture is defined by a stark contrast between futuristic and historical elements, featuring a skyline of "sleek modern skyscrapers" juxtaposed with "mysterious old town alleys". This visual blend creates a distinct cyberpunk aesthetic, where neon-lit streets and high-tech infrastructure exist alongside traditional, quieter districts. Despite its advanced nature, the city is afflicted by a widespread plague of mysterious "emotional diseases," which are the root cause of the central conflict. This societal ailment manifests as supernatural phenomena, disrupting the peace and threatening the population.