This is a set of 13 books from Kodomo Challenge Petit (including one Baby book). It seems that picture books were not issued in May and July. Also, as there are some folds and tears, I am selling them at a low price. I believe your child will still enjoy them. In fact, my child was enjoying reading them until recently. I am not considering selling them individually. At about 120 yen per book, I think it's a great deal. There are also shipping costs, so it's difficult to lower the price any further. Thank you.