This is a prize I won at the Amamiya Sora Live Tour 2024 "Ten to Bluer Sky" live venue. I opened it once to check the contents. After that, I put it in a bag and stored it in a dark place. There are no noticeable stains, but please be aware of this if you are concerned. I am also selling this on other flea market apps, so please comment if you would like to purchase it.