Hyakka Koukyuu Kitan ♡ Reboot! Medatazu Sawagazu Aisarezu, Shitabataraki no Musume wa Koukyuu no Toshokan wo Mezasu

Born with the ability to see demons, Tenka sets out to become the harem librarian after her grandfather's death. She sneaks into the harem as a servant, but for some reason is selected to be an attendant to the emperor's wife, Youko, and her fate takes a major turn...!?

A Chinese harem fantasy with ayakashi and mystery solving!

(Source: Kadokawa, translated)