Joining THE iDOLM@STER credit card is this: a Japanese Monster Hunter branded credit card.
Popular in Japan, Monster Hunter is an action role-playing game that allows players to, wait for it, hunt monsters. The franchise sell millions of copies in its native Japan with games on the PS2, the PSP and the Wii.
There is also an online game on the PC called Monster Hunter Frontier that will get an Xbox 360 release in Japan this summer. An online game Monster Hunter game? A Monster Hunter credit card? Brilliant!