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From ZeroWiki

While continuing my research, I stumbled upon the existence of the shrine that is perhaps the origin of the sleeping priestess.

The shrine is very small and hidden away within the depths of a mountain. It appeared just as in the drawing.

There are normally no worshippers and according to stories from the small village nearby, it is a shrine where you could "offer your pain".

When I called upon the head of the family, she said they allow visitors until the snow melts.
They carry out a rite here to protect a sacred area in the mountain. Men are not allowed in the rite, but it seems every few years they invite men in order to continue the bloodline. They call them "outsiders." I think that I've heard of a similar custom.

The guests who come in winter while the snow falls all hide their faces and pull large bundles on wagons.

It resembles a funeral procession.

The rite carried out on their behalf must be connected to the song of the "sleeping priestess".