[1] The film centres on Mylia (Émilie Bierre), a young girl starting high school who is torn between her new friendships with Jacinthe (Cassandra Gosselin-Pelletier), a bad influence who encourages her to experiment with sex and alcohol, and Jimmy (Jacob Whiteduck-Lavoie), an artistic First Nations student.

[2] The film's cast also includes Irlande Côté as Mylia's younger sister Camille, and Noémie Godin-Vigneau and Robin Aubert as their parents.

In rural Quebec, Mylia begins high school while living with her younger sister Camille and her parents, Nathalie and Henri.

In history class, the students discuss their readings on the Europeans' early contact with indigenous peoples in Quebec.

When students begin asking about passages about the indigenous people's depravity (from the racist perspective of the European settlers), Jimmy becomes angered and has a physical altercation with the boys in the halls.

At the party, Mylia is peer-pressured by her friends to make out with a boy, Vincent, but becomes uncomfortable with the sexual nature of his advances and puts a stop to them.

She writes to Jimmy about learning about the Scramble for Africa, and about how none of her classmates believed her when she said she was from a forest and her friend is an "Abenaki warrior".