Originally Posted by Unregistered

That does sound good, but what about language barrier? Even though FKG players could probably guesswork, how much new stuff will still be unknown?

As Mraktar said - its easy to get into it.
I dont speak JP, and considering most of the interface is identical especially now that some of the major updates hit Nutaku, there is only wery little you will not understand.
Heck even the passive abilities received icons, so once you learn once, what those icons mean, you can quickly build your team just by taking a brief look, no need to read through wiki and such.

Now if there really is something you just cant wrap your head around the Wiki is a very solid piece of info, mostly used for reading up on new girls and mechanics. And then there is the HBC DMM FKG forum part where those of us who play DMM discuss everything.
We have few people who do the translations for patch notes and events so the transparency of each new release is rather good and easy to get into.
Plus you can always ask and most often than not someone will know the answer.