After transferring to a new high school, beautiful Junie (Léa Seydoux) starts dating fellow student Otto (Grégoire Leprince-Ringuet), but she soon finds herself falling for Nemours (Louis Garrel), an Italian teacher already entangled in secret affairs with a pupil and colleague. Loosely based on Madame de Lafayette's novel La Princesse de Clèves, this French drama explores the great pain that often accompanies love.