Okazari Seijo no Hazu ga, Shin no Chikara ni Mezameta You desu THE COMIC

The Kingdom of Elbert once prospered thanks to the blessings of the spirits and the efforts of the Saintess. --Some time has passed, and the Saintess is nowhere to be seen in the temple where the spirits are worshipped. In her place is Sylphia, the "figurehead saintess." Imprisoned in the temple and oppressed by the real saintess, she diligently serves as the saintess's substitute... Then one day, the spirits suddenly appear before her--!?

(Source: Mag Garden, translated)