Isou is the Sazanami burial-force. The Storehouse is the subspace. Hakuri inherits both. Dual inheritance is historically almost unique in the clan. He was scattering his own spirit energy; when he chooses Chihiro, the architecture answers. Volume 4 is Equal because of that choice, not because the house granted it.
Force next to a room
Kyora used the Storehouse as civilization. Hakuri’s version leaves the building. Isou is the shove that is not a pocket. Kudo later spends Warrior’s Path so Hakuri can keep walking. Official chapters: VIZ / MANGA Plus.
File: Storehouse, Hakuri, Hakuri essay.