But the second Japanese game is out in English soon.
Check out GameFAQs release dates, and check out the game info for 'Duel Masters 2'. You'll see that it's the English version of Duel 1418 - Duel Masters 2: Invincible Advance. I downloaded the game, and it rocks. It's fantastic news that it's coming to the US in English soon.
By the way, this game is very simple to play - anyone can enjoy it!