Kamunabi headquarters has levels. Chapter 95 is “Core.” The Shigyu brothers reach Level 1’s underground core with a Hishaku member before Azami ends them. The name register lists Core Station Surveyor and operators, West Entrance Commander, Ishihira, Kashima, as HQ furniture tropes lists named. This site still does not invent biographies for furniture.
A room, not a cast
Yukisada’s Vessel work, Hagiwara’s later magnetism, Hakuri parking the Kamunabi vessel in the Storehouse: those are the core as a system. The titled chapter is the week the downstairs stops being theoretical. See headquarters, Shigyu, barriers.