This is a set of 4 books. These are unread items purchased new, but please understand that they have been stored for a long period. The yellowing appears whiter in the photos than it actually is. Furthermore, initial scratches and scratches from aging are difficult to capture in photos. These are used items. Please understand that there may be yellowing, scratches, and corner folds. We appreciate your understanding and purchase of these items, which are personally stored and inspected by an amateur.