Watari really reminds me of Yuuri from Girl's Last Tour. In other words, a simple creature. I find the implications of the book spirit bringing her over to the children's book section funny lol
Also, can we talk about how beautifully illustrated the library is? I've said this many times, but the art style of this manga really is fitting: it's so shimmery. The architecture is awesome as well, even though it's a location that appears for only one chapter; there must have been a lot of thought and care put into this.