These items were either purchased on Mercari or are used items that have been owned for several years. I have read them only once and stored them on my bookshelf at home. I think they are in good condition, but as they are used items, there is some yellowing due to aging. Please understand this before purchasing. *It's difficult to see the yellowing with a phone camera; if you'd like to know more about the condition, please comment. Please understand that these are stored and assessed by an amateur. You can get a discount if you purchase multiple items. 2 or more books: 300 yen each (excluding sets) I will combine them if you comment. *I am also selling sets, so if one is purchased, I will promptly delete the other. Thank you for your understanding. *In the unlikely event of a double booking, the purchase made earlier will take priority, and the other purchase will unfortunately be cancelled. Thank you for your understanding. I will respond as quickly as possible.