I can't remember if this XX-sama thing was explained somewhere, but I like to assume that in this artist's headcanon the Lunarians are using Eirin's "real" name when they talk to each other, Yagokoro Eirin being just a pseudonym. Omoikane-sama, perhaps, if not something more exotic.
It was a lot of trouble bringing her body here.
Even impurity aside, a corpse is just an empty husk.
Yeah, should've figured.
You really never change, Yorihime-sama...
Right.
Give XX-sama my regards.
Hmm?
Know what?
I've been too scared to ask, but...
You... You know, don't you?
Being buried on the light side of the Moon seems appropriate.
......Well then, we'll be going now.
...Hey, Ringo.
Why should I have to concern myself
with the fates of those who fell to the impure Earth?