Nibante no Onna: Utahime to shite no Hokori o Mune ni, Saigo no Gohoukou o Itashimasu

Arrietty aims to become the highest ranking singer, the "Shrine Maiden Princess," but is sadly defeated. Then, she is proposed to by Joshua, Margrave of Carving, but the engagement is suddenly broken off. After all that has been said and done, Arrietty is then ordered by Carving to be sent out as a priestess...!?

(Source: Kodansha, translated)