Ms. Oropesa slips into the title role as if it were custom couture. In her first aria, “Je suis encore tout étourdie,” sung with enunciation so clear it could be transcribed, she has an innocent lightness that gives way to intoxicating joy as it becomes apparent that Manon is already too grand for her humble packaging at the start: slight frame; childish hat and ponytail; plain outfit in muted blues.

As the opera continues — with Massenet’s effervescent and eclectic score, eager to please and utterly pleasing under the baton of Maurizio Benini — Ms. Oropesa’s musicality becomes even more layered.

It can be easy to play Manon as a ruthless femme fatale, for example, as she becomes the toast of Paris, and Ms. Oropesa was suddenly big-voiced, glamorously tossing off high notes with insouciant sprezzatura. But hear also how she shrinks her sound to a stark mournfulness in “Adieu, notre petite table,” pained yet chilly as she prepares to leave des Grieux for another man’s luxury.