It's time for the return of the rebellious crew from III B and their unconventional teacher Jan Sienkiewicz! Love, troubles and school dramas are the everyday life of Nel, Dante and the rest of the gang. Korek comes to school - a new student, especially gifted in mathematics, who joins Dante's friends. The guys want to teach him how to pick up girls, but it turns out that their advice comes mainly from the Internet. The youngsters' hormones start to stir, which causes a lot of misunderstandings. Dante dreams of his first night with Nel, but she has doubts whether they are ready for it. How to make love and friendship survive this turbulent stage?