Daitoshokan no Hitsujikai was a good story that showed different types of characters and was more or less a stereotypical harem anime. The difference in this was one was that it gave a little something more on the harem plot and it was an interesting story.
Story: The story about all of the characters wanting to find themselves and become someone they want to be proud of is nice. Adding the romance on top of it helps it all go together quite nicely and gives something that was enjoyable.
Art: The art for this anime was good, I liked the designs of the characters a good amount and thought everything was visually appealing.
Sound: If anything this was the worst part about this anime, the sound quality was not the best, especially at the parts where Misono is singing, the audio seemed to dip more especially then. Most of the quality of it in the anime just seemed a bit patchy to begin with.
Character: Some of the characters were interesting and some seemed a bit bland and stereotypical harem. Kakei was the nobody harem protagonist that suddenly ran into a girl which started his popularity, but of course he's oblivious of romance. The female characters seemed to be well developed characters, especially Kodachi, which got seemingly the most character development despite technically not being the main female role, while on the other hand it seems like Shirasaki didn't really get enough development or background other than the parts with her sister.
Overall, I enjoyed watching this anime and I enjoyed the more romance based harem more than the ecchi harem. While it seems like it still had some parts, I definitely enjoy the stories of pure romance quite a bit. Watching the characters overcome their problems and have fun with each other is something that is enjoyable. I would recommend this anime especially for those who enjoy a decent romance story.