[He nods, before taking a moment to rest a hand over his chest, murmuring a soft spell. And then, visibly relaxing as a small wave of light travels from his hand and along his body, bringing with it a much needed rise in temperature. It's not enough to evaporate the wetness of his clothes, but it stops the teeth chattering, at least.]

Come to think of it, I'd heard the people in Sapporo say that the storm that covers the region was supposedly caused by a god who ruled this area before her death.

Thinking of it like that... maybe this structure is actually a tomb? It could explain all the offerings, at least.