Kokoro and her two elder sisters became librarians at the Kokoro Library, located in a mountains far away from the town. Kokoro is the third daughter who has gentle mind though her sense is a bit off. Aruto likes cooking, and is the most realistic second daughter. Iina is an eldest daughter who is very thoughtful of the younger sisters. A funny and heart-warming story about the three sisters. [Text taken from AnimeNfo.com due to laziness]