The film tells the story of Adèle (played by Adèle Exarchopoulos), a 15-year-old high school student who navigates her way through adolescence, friendships, and first love. Her life takes a dramatic turn when she meets Emma (played by Léa Seydoux), a charismatic and free-spirited older woman who awakens Adèle's desires and passions. The movie follows their intense and all-consuming relationship, exploring themes of love, lust, heartbreak, and growing up.