"The Shepherd," a Shiomi Academy urban legend, is believed to come in front of diligent pupils to give them a desire. While reading a book at the school's famed Great Library, Kyoutarou Kakei, a second-year student and de facto head of the Library Club, receives an email from the Shepherd foretelling an event that would change his life. Concerned about the message, Kyoutarou hurries to a local railway station, where he meets fellow student Tsugumi Shirasaki, whom he saves from being hit by a derailing train. Tsugumi joins the Library Club and encourages Kyoutarou to engage in her secret "Shiomi Happy Project," along with other new members of the club, in order to make the academy a better place.