The story follows Rintarō Natsuki, a high school student who inherits his grandfather’s second-hand bookstore after his death. The shop, however, is on the brink of closing due to its declining business. One day, Rintarō encounters a talking cat named Tiger, who claims to be on a mission to save books from being destroyed. Together, they embark on a journey to rescue books that are being discarded or forgotten, each adventure teaching Rintarō valuable lessons about the importance of literature, memory, and human connection.