This is a novelty gift for attendees of the movie "Demon Slayer: Kimetsu no Yaiba - Mugen Castle Arc - Chapter 1: Akaza's Return." In addition to the card visible from the outside, there is a character card inside that is slightly smaller than postcard size, but the character is unknown as it is unopened. #NewAndUnopened #DemonSlayer #DemonSlayerMovie #Novelty #MugenCastleArc #Akaza'sReturn