The Japan Poker League is now running a free online tournament at Pokerstars every Sunday night at 9pm JST. Winners of the online tournaments earn points in the Japan Poker League.
I just looked it up on Pokerstars - the description in the tournament lobby reads, "This series is an eight-month competition where players with the most points compete for a PokerStars Caribbean Adventure package."
Which is true, but not the whole story. The online tournaments are one way to win points. The other way is to win points in the near-daily live games around Tokyo. Every 6 weeks or so is a new "heat" where the leaders have a playoff game to win more points, and at the end of the 8-month season the point leaders will have a final playoff game for the PCA package.
I've seen some referrals to my web page from folks looking for "japan poker league pokerstars password". If you're not in Japan, don't bother - even if you get into the game, you'll win points you can't use for a tournament you can't attend to try to win a PCA package they won't award to a non-Japan Poker League player. Which would include airline tickets from Japan, which would not be much good to you anyhow.
If you are in Japan and are interested, visit the Japan Poker League's home page, where they describe (in Japanese) the tournament series, the live game schedules, and how to apply to get the online password for the Pokerstars games.
If you're in Japan and interested but can't read Japanese, leave me a comment and I should be able to check on the exact process and help get you going.