"Bookish high school student Rintaro Natsuki is about to close the secondhand bookstore he has inherited from his beloved bookworm grandfather. However, one day, a talking cat named Tiger appears and asks Rintaro to save books with him. Of course, "ask" is putting it politely -- Tiger is demanding Rintaro's help. The world is full of lonely books, left unread and unloved, and only Tiger and Rintaro can liberate them from their neglectful owners. And...