Le jour de la Saint-Valentin

Jules, Noa and Dorian are assigned by Couret to integrate the new 4th grade students. However, students and teachers are all disturbed by the construction.

Marc Lambrico, the history-geography teacher, introduces a grade-free system. Kayla is delighted, but not Anaïs. War breaks out between the pros and cons.

Dorian decides to take action to make the canteen 100% organic. Little does he know that the college's supplier is none other than Raph's father, and that things are rarely as simple as they seem.

On this scorching hot day, spirits are high. Maybe that's why Mathis can't stand Kayla making fun of him. He needs to show her who the real man of the class is. But Kayla isn't one to let that bother her.

Anaïs wants Couret to award her the title of best student in the school, as he did for Clément. But the fact that she's a girl doesn't help, and Anaïs feels she must redouble her efforts to prove she deserves the title.

Yasmine and Hippo both want to be elected as class delegates.

Raph arrives at school in her work clothes and shoes full of dirt. She then suffers insults and other humiliations, especially from Lou, who hasn't invited her to his party.

To escape an evaluation he hasn't revised, Mathis pretends he's just learned that his uncle had a serious illness.

Efia is at school all the time, much to her sister's dismay. It's supposedly for Youcef's tutoring, but it's still strange - doesn't she ever have classes in high school?

Yasmine objects to the dissection of frogs. When it is discovered that the fridges have been disconnected and the frogs are unusable, all suspicion falls on her.

Rose spends the day at school before she leaves, but she and Maxime have to be discreet because she doesn't really have permission. They make the most of every moment, but as the hours go by, Maxime becomes anxious at the thought of her leaving again.

On Halloween, Anaïs stops Kayla from telling ghost stories. When Anaïs disappears, Kayla is certain that she has been abducted by one of them. Convinced it's her fault, she sets out to find her...

Hippo and Albert discover that students at Kayla's old school are saying terrible things about her on the Internet. They start to freak out...

As the November 11th commemoration approaches, Couret asks Louise to organize a choir to sing the Marseillaise. But she finds the song too violent and would like to adapt it with the students. This is too much for Anaïs...

Hippolyte pleases his comrades by giving them lots of stuff. Raphaëlle tries to open his eyes to the fact that friendship can't be bought and that all these people are interested. But as far as Hippolyte is concerned, she's just jealous of his popularity.