Rome, late 1980s, Leopardi Classical High School. This is where the various protagonists of the series meet and experience the epic, hilarious exploits of their classmates in 3C, the most outgoing high school students of the entire school year. Bruno Sacchi, a shy, rather plump boy, often awkward but with a big heart. Chicco Lazzaretti, the classic, tireless repeater, obsessed with school and his classmates, always ready to answer teachers in funny ways to distract his classmates. Of course, Daniele and Rossella, typical sweethearts who have grown up together since childhood, are also present, along with the beautiful, blonde Sharon Zampetti, desired by everyone.

A string of sex murders has been plaguing Florence for almost 15 years, in which a serial killer brutally murders couples who are sneaking "a quickie" in public areas. A writer who is doing research for a book about the crimes sets out to uncover the identity of the killer, aided by his beautiful girlfriend. Based on a true story.