Cheng Xiaoyu, an ordinary librarian, suddenly inherits a mysterious bookstore called the Fantasy Bookshop and discovers that it is more than just an ordinary bookstore: it is a gateway connecting different worlds.
Cheng Xiaoyu meets Mobai, an employee who can transform into a black cat, and learns that as the “Gatekeeper,” it is her responsibility to maintain the balance between the real world and the fantasy worlds.
