Card: Double King Fighting Card Extraordinary World

[Original card]+[Multiple heroines]+[Non-turn-based] In 2306, my city was rated as "the most popular area for playing cards". The main reason... People really don't seem to be good at playing cards. In this world where double king card fighting is the main means of competition, those who cannot play cards are like the protagonists of American bullying. They are born to be looked down upon. It's not that Youtian doesn't know how to play cards, and it's not that he doesn't like playing cards. It's just that in order to run the declining card experience center at home, he had to bow to his sad fate. However, when his grandfather pressed the family treasure into his hand, Youtian was stunned. No? What does it mean that our family heirloom is a trump card?