In
Los Angeles, Elle Evans and Lee Flynn have been best friends since birth. When she is 11, her mother becomes ill and dies three years later. Elle's secret crush on Lee's popular older brother Noah deepens, which she suppresses. On the first day of her
junior year in high school, Elle is forced to wear a too-small skirt. When fellow student Tuppen touches her inappropriately, Noah begins fighting with him. Tuppen, Noah, and Elle are given detention, where Tuppen apologizes. Elle later agrees to go on a date with him, but he stands her up, as Noah has warned everyone not to pursue her. Elle and Lee propose having a
kissing booth as a school fundraiser. At a party, she tells the popular OMG girls (Olivia, Mia, and Gwyneth) that Noah will be part of the booth, despite him having already refused to participate. The kissing booth goes well until Noah is meant to participate but Lee takes his place, disappointing the girls. A classmate, Rachel, steps up to kiss him, and the two leave Elle to staff the booth. Annoyed with Elle, the OMG girls set her up to kiss an undesirable student. At the last second, the student waves Noah ahead. He kisses the blindfolded Elle, and when she realizes it is him, they kiss again in front of everyone. Noah offers Elle a ride on his motorcycle, and rain forces them to take shelter in a
gazebo. There, she kisses him, but then tells him she refuses to be just another sexual conquest. Hurt, Noah reveals he has feelings for her. At a beach party, Warren tries to get a resistant Elle into a
hot tub. Noah defends her, Warren taunts him, so Noah attacks him while Elle escapes. Noah catches up to her and gives her a ride home. He apologizes for his violent reaction to Warren's slight. They detour to the
Hollywood Sign and have sex for the first time. There, they establish rules for their relationship, with the principal aim that Lee not find out they are together until Elle figures out how to tell him. Noah swears Elle to secrecy when she discovers he has been accepted at
Harvard University. While helping Noah fix his motorcycle, Elle cuts her face. Lee finds Noah cleaning the wound and accuses him of hurting her. When Lee asks Elle if she and Noah are dating, she says they are not. After agreeing to tell Lee the truth, he walks in on them kissing. Furious that Elle has broken an important friendship rule, Lee runs to his car, saying their friendship was the one thing his brother never had and that now he has nothing; he then drives off. Elle lashes out at Noah, blaming him for exposing their relationship, so he leaves on his motorcycle. Noah risks not graduating by being absent from school for the next few weeks. Lee completely ignores Elle. Finally, she sees Lee at the arcade, where he invites her to dance with him, and they reconcile. Elle goes to
prom with Lee and Rachel, whom he is now dating. Huge black and white photographs adorn the walls of Memory Lane, a special prom exhibit, including the photos of the kissing booth. Noah emerges from the back, asking Elle to the stage and declaring his love for her publicly, but she runs away. He apologizes to Lee at home, telling him his feelings for Elle are serious despite the fact he is leaving for Harvard the next day. At Elle and Lee's birthday costume party the next day, Elle confesses her love for Noah to Lee. He relents, wanting her to be happy and agreeing to help her find Noah. Driving Lee's car, Elle shares her feelings for Noah with "Lee", dressed in his
Batman costume, only to discover it is Noah in disguise. Elle and Noah spend the following weeks together before he leaves for college. Watching him go, she is unsure if their relationship will last, but she knows a part of her heart will always belong to him. ==Cast==