Relativity Theory This is a tape exchanged using Mirai's Summoning Card. I believe it was a merchandise item you could get by purchasing Mirai's Summoning Card at a live event's merchandise booth and using the card at the next live. Unused, and has been stored away. I've never used it, so I don't know what the design is like or if it even works. Please understand this before purchasing. Of course, it's no longer available, and it's not often seen on the market. #RelativityTheory #Etsuko Yakushimaru