Story of a beautiful but unfulfilled housewife Séverine Serizy, trapped in a conventional marriage. Seeking to escape her mundane existence, Séverine secretly embarks on a double life as a daytime prostitute. Each afternoon, she assumes the alias “Belle de Jour” and explores her hidden desires and fantasies. As Séverine’s life spirals deeper into a realm of eroticism, she navigates a complex web of pleasure, pain, and personal discovery, all while struggling to keep her secret life hidden from her husband. This is a seductive exploration of desire, identity, and the blurred boundaries between reality and fantasy.