This is an illustration shikishi (colored paper) from the Demon Slayer: Kimetsu no Yaiba movie bonus. (I believe it's from the first movie, "Kimetsu no Yaiba: The Bonds Between Brother and Sister.") It's new, unopened, and has been stored in a dark place. However, several years have passed since I obtained it, so there may be some deterioration. It doesn't appear to have any noticeable stains, but please be aware of this if you are concerned.