After purchasing all volumes, I kept them in book covers. Volumes 1-4 were purchased as a set. As a bonus, Komi-san's student ID card is included. Volumes 1-4 have different covers from the standard editions. Tadano-kun's student ID card is also included. There is some yellowing throughout all volumes. Please check the photos. There is no problem with reading them. These are used items, so please understand this before purchasing. I am not considering selling individual volumes.