Manon, a beautiful young girl from the provinces, is said to be brought to a convent by her brother Lescaut. The student Des Grieux falls in love with her at first sight. Geronte, a rich old man, is also impressed by Manon and plans to kidnap her. Edmondo informs his friend Des Grieux of Geronte's intentions. After Des Grieux Manon confessed his love, they flee together. Lescaut assures Geronte that Manon will soon be fed up with life in poverty and will voluntarily turn to Geronte and its prosperity.