I purchased this a while ago, so I don't know the expiration date. I opened it to check if it was usable, and it was. Therefore, one is used. → Therefore, there are 27 remaining. *I opened it for confirmation on January 9, 2026, so I would appreciate it if you could purchase it soon. *Since there are unused ones, it's possible to mark them as new. 《I will sell the 28-piece set for 700 yen each》