Bookish high school student Rintaro Natsuki is about to close the secondhand bookshop he inherited from his beloved grandfather. Then a talking cat named Tiger appears with an unusual request. The cat needs Rintaros help to save books that have been imprisoned destroyed and unloved. Their mission sends this odd couple on an amazing journey where they enter different labyrinths to set books free. Through their travels Tiger and Rintaro meet a man who locks up his books an unwitting book torturer who cuts the pages of books into snippets to help people speed read and a publisher who only wants to sell books like disposable products. Then finally there is a mission that Rintaro must complete alone...