The Plot

They didn't expect to land in such a place.

Four girls with little knowledge of this other world stumble into Cardverse, unsure of where to go and how to act. Luckily, the King of Spades decides to accommodate them for the time being...however, with the presence of other Kings and other Kingdoms in the land, it's quite hard to ignore the temptation of venturing elsewhere. 

Herzen, Spades, Diamants, and Treboles. What's so peculiar about these places? 

Moreover, what is this Royal Flush the royalties put so much attention on?

From behind, a crow looks on.