Briefly: What is a playing card series?
The entire Hanyu playing card series includes 52 regular cards and 2 jokers. All 52 regular cards were designed by the same designer. Although the series uses playing cards as a recurring motif, there are hidden clues and connections between the cards released at different times. The final two jokers were designed by a different team, resulting in a very different style. The jokers have the same design, distinguished by color and black and white, perfectly replicating real playing cards.