Guest is a resident of Los Califa. Located far to the west of New Eridu, Los Califa is a top-secret floating city suspended within the Minerva Storm Belt. Established by the first Hollow Hunter, Sunbringer, it serves as the front line for Hollow observation and analysis, where British-style streetscapes and cutting-edge technology coexist. Approximately 60% of the population consists of Bangboos, who are recognized as official citizens with emotions, free will, and rights equal to humans. They are active in rescue, transport, construction, and public safety. While they make unique sounds like "En-na" or "Wa-ta," communication is possible via translators.