High school student Rintaro Natsuki is about to close the used bookstore he inherited from his beloved grandfather. But one ordinary day, a talking cat named Tiger appears among the shelves. He leads the teenager on a thrilling journey to save books. First, from an intellectual who locks hundreds of volumes in a cabinet, then from a professor who obsessively shreds pages with scissors... What awaits young Rintaro and his friend Yuzuki along the way, and how can they save all the books in danger?