Good luck, girl. I had a couple white friends from the US and Australia model while we were studying in Tokyo, and they got flown to tropical islands during holiday and got paid hella cash. Thousands upon thousands for weekends' worth of work.
Here's a video of one of them now. I think he did more TV show stuff than modeling, but whatever. Compare your attractiveness to his and consider your chances.
YouTube - Go Ji ni Muchu 2007-01-21 Stephan Fisher
I think he's doing all this all part time while working on his masters or something in Tokyo.