Françoise, Emanuelle's younger sister, lives with Carlo, a man of less than good reputation, with whom she is completely in love. Carlo is a playboy, involved in shady dealings, and always owes money to guarantors because of his gambling. Françoise suffers constant humiliation and is treated like a rag. Carlo forces her to prostitute herself and pose in erotic magazines to earn money. One day, Françoise comes home exhausted from work and finds Carlo in bed with one of his lovers. He insults and scorns her. She can't take it anymore and runs out of the house in tears. She tries to contact her sister Emanuelle but can't find her. Desperate and with nothing to console her, she takes her own life by throwing herself in front of a train. Before dying, she leaves letters to her sister in which she tells her about all the bad life Carlo has given her. Emanuelle seeks out Carlo for revenge.