Both were purchased on Amazon in 2020. The list price for each was 1,300 yen + tax. I read both books about twice. After that, I stored them on a bookshelf. The spine of the "Tsukarenai Daihyakka" (Encyclopedia of Not Getting Tired) is a little faded. I didn't keep it in a place where it would get direct sunlight, but if you're concerned, please refrain from purchasing. Please see the images for any scratches. I would like to sell these to someone who understands that they have been stored at home. Please purchase with the above in mind. Please refrain from purchasing if you are looking for a perfect condition. If you have any questions, please feel free to comment.