"A Última Festa" tells the story of a group of four best friends at their high school graduation party. Each one of them has their own romantic comedy plot over the course of a night where anything can happen.

A couple of lovers who decide to split up because they are too young for such a long relationship and their friends insist that they should enjoy life. Another couple seeks an empty room at the party to lose their virginity. A guy tries to win over the man he's always been in love with with unusual tactics. A love story emerges in the infirmary of the party, where several young people are suffering from excess of alcohol.

It's their last night as teenagers. The last night with their friends before splitting up to different universities. The last night before the rest of their lives.