Melissa understands numbers-1+1 always equals 2-but when it comes to dating, things never seem to add up. The last thing Melissa wants is to spend another Valentine's Day alone, but that doesn't mean she wants to get set up, either. When the principal asks her to help supervise the sophomore class presidency plan their Valentine's Day dance, she decides there's no way she'll become the lame teacher who shows up without a date to the dance...