Sayaka Hayasemaru

A librarian, who sets down Ishidaira on a path to (re)discovering his love of reading by prompting him to reimburse a borrowed book he had lost. She is passionate about her work and acts as [Ishidaira](https://anilist.co/character/296283/Kiichi-Ishidaira)'s guide to the inner workings of a public library.