At first throughout the series, I didn't like the shy library girl and was pretty much one of my least favorites out of the candidates. However this episode changed my my mind because they mainly focused through her point of view which was quite funny and cute.
Also once again, our hero cross dresses and explains in a reasonable strategic way on why he did it. So other than that, the plot was pretty simple and romantic. They basically stayed at the library for the entire time just like in the previous season. I'm still enjoying this season as the same from the previous seasons and as usual, definitely can't wait for the next.
Conclusion: Interesting episode focusing on the library girl.