Nikki is a student in the other 4th Grade Classroom, when Mrs. Krabappel is away for a week, Bart's class are forced to share desks with then, Bart ends up sharing Nikki's desk, an idea Nikki isn't too fond with, but she soon starts to develop feelings towards Bart.
Bart in return has feelings for Nikki and consults with Grampa on what to do, he suggests that Bart should kiss Nikki. He does, but it doesn't go over well, and Nikki's parents threaten to sue the school over something Superintendent Charlmers knows has been blown out of proportion.
Nikki and Bart keep their relationship a secret, but since Nikki keeps changing her attitude towards him, Bart walks away and accidentally falls of the roof of the school. Bart is found to be alive and Nikki then uses CPR on Bart to save him. Nikki explains to Bart that there's alot he doesn't understand about girls.