How to live happy and rich without working? To be Gigolo. But after 25 years of living with Denise, Alex the "gigolo" gets fired without notice and finds himself on the street. Forced to move to his sister and his nephew of 10 years, he then has an obsession: find quickly a rich heiress.

Back to school for Ducobu, Léonie Gratin and Latouche. But this year, a major rival for Ducobu arrives at school: TGV, the king of cheating 3.0. While the financial situation of Saint-Potache becomes disastrous, the two dunces will have to unite their creativity to win a song contest and save their school.