Four friends, annoyed at how almost everyone else they know is having sex but them, agree to do what they can to help each other lose their virginity before the end of the summer. Most of their opportunities are foiled by their inexperience and bad planning. Michael, the most sensible boy of the foursome, really just wants to stay with his long-time girlfriend and take their relationship to an intimate level, but after putting him off for six months he grows impatient and splits up with her to seek his fortune elsewhere.

Daniel moves to Los Angeles with his mother, Lucille, and soon strikes up a relationship with Ali. He quickly finds himself the target of bullying by a group of high school students, led by Ali's ex-boyfriend Johnny, who study karate at the Cobra Kai dojo under ruthless sensei, John Kreese. Fortunately, Daniel befriends Mr. Miyagi, an unassuming repairman who just happens to be a martial arts master himself. Miyagi takes Daniel under his wing, training him in a more compassionate form of karate for self-defense and later, preparing him to compete against the brutal Cobra Kai.