All four books are wonderful stories that I highly recommend reading. (I was particularly moved by the novel in the upper left corner, and it's one of my favorites.) "Exchange Lies Diary" has a slight crease as shown in the second photo. Please refrain from purchasing if you are concerned about this. This is a set of four books, two each by Iiyo Sakura and Asuka Kikukawa. - Title: Until You Forget Your Tears. - Title: The Blue Sky You Dropped - Title: Even If I Forget Tomorrow - Title: Exchange Lies Diary Thank you for looking.