I'm selling these books because my son, who loves insects, has stopped reading them. "Mushi-tachi no Oto no Sekai" has a fold-out supplement, but as the image shows, it's stained. The other two books do not have fold-out supplements. Some of these books were old when I collected them, and they were also read by my child, so they are not in perfect condition. I hope those who understand that these are used items will consider purchasing them.