The last summer before college. Elle will have to make the most difficult decision in her life: go across the country after her amazing boyfriend Noah or keep a long-standing promise to go to the same college with her best friend Lee. Whose heart will El break in the final part of the "The Kissing Booth" trilogy?
High school student Elle Evans, who spent the most romantic summer of her life with her boyfriend Noah Flynn, is now forced to briefly break up with him during his time at Harvard. She practices long-distance relationships, but is frankly afraid of losing a guy after learning that he has made a strong friendship with a student, Chloe Winthrop. In parallel with this, the girl, along with her best friend Lee, wants to repeat the charity fair "Booth of kisses", where she plans to lure a new student, the handsome Marco Peña, who is liked not only by all her classmates, but also by herself.
Ale studies at high school. She is an ordinary-looking little girl at whom never before was the guy. The key heroine has decided to participate in a competition where she has presented the kiss there is nobody I Ache. The vainglorious guy has at once won the heart Ale, only she understands that to apply for him she not in the right. It turns out that he is a brother of her close friend with whom they have a contract. Because of it now the girl very much suffers as she goes against the desires, but also can't go in defiance contracts. It is necessary to make her the risky decision after which her life will turn over upside down.