This is an official trading card set. I recall that it was a limited release of several thousand to tens of thousands of boxes at the time of its release (I believe it was limited to 15,000 boxes). In Japan, there are few people selling them, so I think it's quite rare. Contents: 18 character cards This is a complete set of character cards. There are 4 packs per box, and 8 cards per pack, making it a series where it was difficult to complete the full set with just one box due to the small number of cards per pack.