For the sake of this ad, I will just call this girl Chanel. You can name her anything you want. So, Rika and Chanel were childhood besties once upon a time ago. Chanel does not have to be from the same place Rika is, you could make it so her dad is employed in a company that makes him move around a lot, or something. But, anyway, Chanel moved away and Rika still misses her like crazy, even though it was forever ago. Then Chanel moves here and Rika is thrilled. However, they both have changed and don't really know how to get along anymore, causing drama. They still want to be friends, but it's hard. Only time will tell how their friendship goes.
Since Chanel Iman and Behati Prinsloo have a bunch of pictures together, I figured Miss Iman would be the best for this girl, but you can choose anyone, really. Her personality could be just about any, as well.