Here come the Crown Knights: Sunday Spades — the poker-faced leader and possessor of the mysterious trump power! Jo Diamonds — who can run at the speed of light! Casa Clubs — combat expert who possesses hyper-senses! Coco Hearts — the tricky master of psycho-magic!

Together, these cute, card-carrying champions are dealing a world of hurt to the criminals who threaten the tranquil Card Kingdom. But can they checkmate two, invading war machines — shaped like gigantic chess pieces — before the kingdom topples like a house of cards?