My child used to attend a national university-affiliated elementary school, and apparently, they were very popular among the male students there. [Important Notes] ① This is a set of 1-19 volumes, as I did not purchase volume 20 because I borrowed it from a friend. The complete set is 20 volumes. ② Some volumes have slight cover creases, but the contents of the books are in relatively good condition. ③ Volume 12 has some damage to the top of the cover because I was holding it in my hand while walking in the rain, even though I was using an umbrella. However, as shown in the last image, the contents of the book itself are not dirty. I wanted to describe the condition as better, but due to the issue with volume 12, I have lowered the condition rating for this listing. Please understand the above and purchase with the understanding that no claims or returns will be accepted.