This is a sticker of Yofukashi no Uta's Akira Asai and Midori Kobenurui, a limited-edition item from Suntory vending machines (currently discontinued). The sticker itself has never been peeled off, and the stickers on both sides are attached to a transparent backing sheet. There are no scratches or stains. I am also selling this on other apps, so I may delete it suddenly.