Naginojoen (凪浄苑) is the Sazanami ancestral graveyard on the bottom floor of the auction house. Clan leadership, and therefore ownership of the Storehouse, passes here. The Emergency Access Door’s real-world counterpart sits in a sealed room inside it. Shiba cannot teleport into the Naginojoen. The Tou guard the hallway. That is why the 208th infiltration is a walk, not an extraction.
Cemetery as architecture
Chihiro finds a door in the Storehouse and reads it as a twin. The twin is here. Hakuri lures Soya away. Shiba beats the remaining Tou and tells them to go home and raise the younger members. The trio enter to find the emergency door already destroyed. Kyora has already spent the insurance. The Storehouse page is the subspace. This page is the grave that holds the spare key. See Storehouse, emergency door, the Tou.