Koishikawa Miki, a typical, ditzy high school girl. A popular girl wou likes to play tennis, she seems to be living the good life. She thinks nothing of the vacation her parents take to Hawaii...until they return and announce that, not only are they getting a divorce, but that they are getting remarried! Apparently they had affairs with another Japanese couple and have decided to swap spouses. (Wasn't that the plot of a 70s movie?) Of course, things only get crazier when she meets the completely aloof, yet oh-so-handsome son of the other couple, Matsuura Yuu. Naturally, despite the fact they're practically step-siblings, they fall for each other. But they try to keep it a secret from their family, and most of the school. (Never mind that the rest of the school is preoccupied with their *own* jumbled relationships.)<br />