Great S.O.L. manga. Really good MC with an interesting outlook on life, fun supporting characters, and gives you the insights of a library in the modern age.
10/10
Not because it's the best, but because it managed to get me engaged, even good anine like FMA:B considered one of the best anime never got me interested.
One of the best manga I've picked up in years, and I probably wouldn't have bothered with it if it wasn't so highly rated. One of the few times I fully agree with said rating.
If you like Slice of Life manga at all give this series a read. You don't need to even give a shit about books or libraries (though it helps if you do). Though the manga centers around the library, it's more about the people who work and visit it and their lives and philosophies. It also happens to be rather humorous and manages to keep a light tone even while handling deeper/heavier subject matters.