The Haunted Bookstore Vol 3 Manga

The Haunted Bookstore: Gateway to a Parallel Universe by Shinobu Shinotsuki. A Fantasy manga rated Teen, published in English by Seven Seas.

Kaori was abandoned as a baby in the spirit world and raised by Shinonome, a grumpy yokai who runs a bookstore for spirits. Now grown, she helps him run the shop, discovering the stories that connect the world of humans and the world of spirits.