Keyvan’s father has just passed away, leaving him and his brother Mansoor the ownership of the Hodhod bookstore. Meanwhile, Mansoor has a struggling company and is thinking of buying Keyvan’s share of the bookstore and turning it into a fast food place. Against his will, Keyvan agrees to the deal for the sake of his sister. He then meets Gholam, a bus driver, who suggests they turn his old bus into a traveling bookstore or as they later call it a ‘book-bus’. Keyvan agrees. The ‘book-bus’ travels to a different part of Tehran in every episode, leading to bitter-sweet events as Keyvan and Gholam meet different people and help solve their problems through books.