Kyōtarō Kakei has always had an affinity towards books in hopes to find answers to his life. With a mentor's promise, he continues to search for a book with his absolute hope. However, this changes when he receives a foretelling message saying that "Today, something will happen that will change your fate. --From the Shepherd." Due to this premonition, his normal school life at Shiomoi Academy becomes entangled due to the optimistic
Tsugumi Shirasaki and the Shimoi Happy Project.
The story is set at Shiomi Academy, a vast, prestigious academy with a Daitoshokan (literally, "great library") that rivals Japan's national library. As a member of the Library Club,
Kyoutarou Kakei goes to Daitoshokan to enjoy reading by himself. He then meets a second-year girl named
Tsugumi Shirasaki through the efforts of a so-called "shepherd" who fulfills people's wishes. Eventually, more girls join the club thanks to the "shepherd."