The premise of this manga has a lot of potential, a library full of spellbooks containing dangerous creatures. The story started off pretty well, with an interesting beginning and some library-related incidents that made me smile with their relationship to real libraries (I did wonder if the author is a librarian or has worked in a library). 

Unfortunately my enjoyment did go down somewhat as the story continued. The plot failed to really hold my interest and it wasn't helped by the fact that the art was sometimes hard to interpret. The characters seemed interesting but didn't feel fully developed in this first volume. The cliffhanger ending was also honestly annoying. 

Overall I think it is decent but underwhelming. It is only the first volume and I do believe the premise and characters have enough potential that the series could easily improve as it continues. Considering how expensive manga can be though, unless I find volume two in a library one day, I might not end up reading it.