This is a set of 15 books from the Nontan series. The regular price is ¥600 per book. I remember collecting them over about two years, starting around 10 years ago. The books are relatively clean when the covers are removed, but I will be selling them with the covers on. The condition of the covers is shown in the photos. Please refer to them. "Spoon Tantantan" does not have a cover. I checked the insides and there were no markings. (I apologize if I missed anything.) These are used items, so please refrain from purchasing if you are looking for a perfect item. I am not offering discounts. I would like to sell the entire set, so I am not selling individual books. I am also not offering holds. Thank you for your understanding.