Shiyoko is an energetic young girl who's all about playing cards. Unluckily she transferred to a new high school where no one seems to be interested in her hobby. This manga was bundled with various WeißSchwarz TCG products in the "Card Game Shiyoko Ultimate Starter" - Box, which was released on march 25th 2016. I recall that Shiyoko's adventures are also in Bushiroad's monthly magazine, but as I don't have these on my hands I can't confirm if those differ from what is in the volume. For now I'll assume they will, which is why the status is ongoing~