It's fun to be a Baby-sitters' Little Sister! At first, Karen and Ricky were enemies. But now they like each other. They are even going to get married. Only now, Karen and Ricky are in a big fight! First, Karen puts gum in Ricky's desk. Then Ricky calls Karen Four-eyes. Soon, the class is having a Valentine's Day party, which makes everything even more awkward. Their teacher tells the class that they only need to give valentines to people they really want to. Karen makes a decision. Is it the right one? And will Karen and Ricky make up ... or break up?