Vector started today (December 16) the official operation of the Rumble Burst PC TCG game in Japan. The game available for free and you can move your data from the yesterday held Open Beta Test.
This game is similar like any other PC card game. You have your deck and you have to defeat the enemy which can be CPU or real people from the internet (the game at the moment available only in Japan).
The game current has more than 400 different cards and Vector going to adds even more in the near future. If you like the TCG games and you can login (use VPN) than you must try this game too.