Well, Prince Kyle and Karina have a long back story. There are other characters in the fan story too, like Madison, Princess Miranda, and Craig.
So, it begins when Karina needs to go to a rehabilitation camp because she was a victim of a rape and assault because of her brother, Ryan. So, her father wants her to go to one, but she doesn't want to go without her friends, Madison. As comical as Karina's father is, he thinks Madison's crazy enough that they'll let her in to =D.
Now here's a chart, might help, LOL.
Karina-Protagonist
Madison-Secondary Protagonist (Karina's BFFL)
Prince Kyle-Romance Option
Princess Miranda-Bitchy, but helpful