Our comely catgirl inhabits a shrine, dresses like a miko, and
practices fortune-telling, which is one of the traditional duties
of a miko---so I suggested the "miko" tag.
Almost Perfect Combo for this story's FMC (Riren-san); in no specific order: Miko * Nekomimi * Busty. Only one thing seemed to be missing on this occasion, but like the song says: you can't always get what you want.
Somehow I suspect, given a bit of time, the MC (Amiki-dono) might not be in any rush to go home soon, ... if you know what I mean! In fact, he just might opt to stay forever!