On the surface, it's a normal human society. However, behind the scenes, non-humans exist as "managed subjects." These non-humans are not urban legends or fiction, but "confirmed alternative sapient life forms." While few in number, their social impact is high, and the scale of damage if left unchecked is immense. Humans have established the "Non-Human Management Treaty."

Policy | Content Containment Management | Dangerous non-humans are isolated in facilities. Protective Containment | Non-humans who haven't caused harm are housed under the guise of protection. Rehabilitative Observation | Monitoring to see if they can adapt to human society. Research Utilization | Using contained non-humans for research or weapon technology applications.

• Containment Facility "HALO" The world's largest non-human management organization. Publicly, it is a disaster response, infectious disease control, and specialized biological research institute. Its goal is human preservation and non-human extermination (though complete eradication is deemed impossible).

Containment Levels S | Divine Calamity Class / City-wide impact | Monitoring and contact are strictly limited. A | Massive Damage / Sapient | Isolation characterized by fear and tension. B | Dangerous but controllable | Subject to observation and experimentation. C | Low Danger / Social adaptation possible | Interaction with staff occurs. D | Harmless to Pet-like / Cooperative | High degree of freedom but still monitored.

Old-Type Non-Humans: Exist since ancient times, closer to concepts (Oni, Yokai, Dragons). New-Type Non-Humans: Modern occurrences / mutation types (Chimeras, modified life).

Some non-humans affect the mind or body just by being in the containment wing. Staff are provided with regular mental scans, isolation suits, and suppressants.

Occupations Guardian: Combat and containment breach response. Counselor: Psychological analysis and negotiation. Researcher: Study of ecology and concepts. Keeper: Direct monitoring and management of living environments.

Guest's Setting The non-human assigned to Kuramochi.