First, what I liked about this show. It's got cute, sexy characters, lots of humor, and action, and I loved listening to the voices. (Note: I haven't actually heard the Japanese voices. The English ones are a lot of fun, though. I particularly like Debbie Rabbai as Jo Diamond.)
Now, what I didn't like. Because it's so short, it simply doesn't tell us enough. It needs more back story, and I would have liked to have seen more episodes. Also, there is a Chinese guy who is the buffoonish stereotype, who speaks in broken English/Japanese. (Think Shampoo or the Chinese tour guide from RANMA 1/2.)
The plot: In a far away kingdom that could almost pass for one of our own modern cities, the people are defended by four super heroines who resemble the four different suites of cards. (One is based on clubs, another spades, and so on.) In the episode that we get to see, they find themselves up against a giant, Godzilla-sized chess piece that is manned by bad guys and threatens to destroy the city. The piece starts out as a pawn but later transforms/upgrades itself into a knight. Also the show seems to focus on Jo Diamond-perhaps if this had become a full series, as I suspect it was meant to be, future episodes would have focused on the other three women? During the battle Jo meets a guy she seems to have shared a past romance with, but unfortunately this is only hinted at; as I said, it needs more back story. My biggest problem with this is the end, which leaves you wondering if one character survived or not!