On the day of his high school graduation, valedictorian Denis Cooverman decides to break free from his nerdy, inhibited existence by declaring his love for the most popular girl in school, Beth Cooper, during his commencement speech. This bold move shocks Beth and the entire audience, setting Denis off on an unexpected adventure. Despite his declaration being completely out of the blue and seemingly unreciprocated, Beth, intrigued by his audacity, decides to show Denis and his best friend, Rich, a night they will never forget.

What starts as a dream come true for Denis quickly spirals into a series of comedic and hazardous events when Beth's boyfriend and his army buddies catch wind of Denis's public confession. The night becomes a wild ride of parties, car chases, and teenage antics, pushing Denis far out of his comfort zone. Through these escapades, Denis, Beth, and their friends confront their fears, insecurities, and the realities of leaving high school behind, all while forming unexpected bonds and learning what it truly means to live and love without holding back.