A disclaimer: This is an RPG! No card duels! No card duels! No! Card!! Duels!!!
Also, in a way, this is a slow-burn story, so some things won't progress very quickly.
The card game rules will have to change somewhat to fit the RPG format. The story will also require some DIY cards and special alternate-art cards. If you can't accept that, you can go read about other protagonists playing cards next door. (They use cards from the anime, and you don't mind that, after all.)
The author has a bad case of introduction-itis. Here goes:
"Card players don't date, except for card spirits." Jiang Youtian pulled out a stack of waifu cards and shouted, "So you're all my wings!!!"