Considering the fact that a considerable number of the Gamingforce community peruse Japanese-related media (ranging from anime to manga to J-music to J-porn), it's no wonder that many of GFF has actually taken the time to try to master the language it's delivered through, fail hopelessly and then proceed to make threads about it.
http://gamingforce.org/forums/showthread.php?t=2035
http://gamingforce.org/forums/showthread.php?t=15063
http://gamingforce.org/forums/showthread.php?t=4511
The topic has been beaten more times than Paris Hilton. But to help, I took it in high school and college and found Genki to be a really good book, it's structured well in terms of introducing grammar points but as I recall, the vocab was kind of wonky. Like tall would be introduced in one chapter and then short would be introduced 5 chapters later. Also it's really lacking in substantial kanji so you have to buy other books for that, I used The Basic Kanji Book by Bonjinsha Co. in my kanji class. I guess what you can do is just memorize sentence structure, grammar patterns, verb conjugation, kanji and vocabulary but after 6 years, I realized that you can only get so far with the language through strictly academic avenues and you really have to get in a situation where you are forced to use the language. Watching anime, listening to JPOP and reading manga doesn't cut it so invade Japan with your ferventness, immerse yourself in the language and culture and you too, may score a petite Japanese girl.
Jam it back in, in the dark.