Penny Harris just ruined her life. As one of the most popular girls in school, she can't wait to rule senior year with her best friend, Olivia. But when Penny wakes up on Jordan's lawn the morning after his first-day-of-summer bash, she knows something went terribly wrong the night before. She kissed Kai Tanaka. Kai, her long-time nemesis. Kai, Olivia's boyfriend. And despite the fact that Jordan seems to be seeking comfort (and a whole lot more) in Olivia, all Penny can think about is winning him back. Kai wants to save his relationship too, so they come up with a plan: convince their friends that they really do have feelings for each other. After all, no one can resist a good love story, and maybe seeing Penny and Kai together will make Jordan and Olivia change their minds. But as summer heats up, so does Penny and Kai's "relationship," and Penny starts to question whether she's truly faking it with Kai, if he's really as terrible as she always thought he was, and if the life she's fighting so hard to get back is the one she really wants.