Thank you for viewing. This is a set of "Why? How? Everyday Questions" for 3rd to 5th graders. In addition to this series, we are also including "Interesting Stories: 10-Minute Reading" as a bonus. There are minor scratches and stains, but there are no problems with reading. The red circle in the third photo shows marks left from a sticker that was kept on for many years. Please be aware of this. This item has been stored at home, so please purchase only if you understand this. Price negotiations (discounts) are not accepted. We strive for courteous transactions until the end, so thank you for your understanding.