Antoine, a young Parisian suburbanite, studies accounting without much conviction, dividing his time between the rap battles he practices with talent and his job as a sushi delivery boy. During an errand at the Garnier Opera, his path crosses that of Mrs Loyseau, a singing teacher in the venerable institution, who detects in Antoine a raw talent to be developed. Despite his lack of operatic culture, Antoine is fascinated by this form of expression and is convinced to follow Mrs Loyseau`s teaching. Antoine has no choice but to lie to his family, his friends and the whole city, for whom opera is a bourgeois thing, far from their world.