The narrative takes place at Shiomi Academy, an esteemed institution with a renowned Daitoshokan library that rivals Japan's national library. As part of the Library Club, Kyoutarou Kakei visits the Daitoshokan to read alone. He encounters Tsugumi Shirasaki during this visit through the assistance of a "shepherd" who grants people's wishes. Later on, additional members join the club due to the "shepherds" influence.