The film follows the story of Adèle (played by Adèle Exarchopoulos), a 15-year-old high school student struggling to find her place in the world. Her life takes a dramatic turn when she meets Emma (played by Léa Seydoux), a free-spirited and charismatic older woman who awakens Adèle's desires and sets her on a journey of self-discovery. The film is divided into two chapters, each representing a pivotal phase in Adèle's life.