"I'll have you join me in matrimony..."

Toono Itsuki is a university student who majors in folkore studies. He's currently headed towards his grandparents' hometown as part of his thesis' fieldwork. There, a local warned him to "not get close to the mountain on days when the rain is cold". Despite the warning, Itsuki still went towards it and there he met!?

Here's a BL about a local god and a folklore geek!