[Her nose crinkles, just a little, and Hakkai politely doesn't snicker at her as she makes the burnt-tongue face. He puts his coffee back down to wait a few more seconds before he makes the same mistake.

Yomi, though... his expression darkens with memory, and he reaches out to sketch two characters on the table: yellow spring, Yomi, the name of the underworld.]

When you say "yomi," is it written like this?

If so, then it does exist here. There is -- or was -- an entrance to the south. There's no need to hold it back with sacrifices, though, at least not from what I saw.