Sara, wife of the politically connected Count Cluny, possesses an undefined background beyond her noble marriage and courtesan status. Distinguished by dark hair and pale skin, she exudes sophistication and melancholy. Discovering Marion collapsed outdoors, she brings him into her home, initiating their relationship.

Emotional emptiness in her marriage drives Sara into an affair with the significantly younger Marion, seeking to fill a void rather than lasting commitment. As Marion’s first sexual partner, she guides him with tenderness and pragmatic awareness of the affair’s temporary nature, acknowledging societal constraints and marital obligations.

Sara recognizes Marion’s emotional immaturity beneath his "rationalism." Through their interactions, she inadvertently exposes his vulnerabilities and catalyzes his confrontation with love, jealousy, and loss. Demonstrating insight into his struggles—particularly during conflicts with friends Claude and Ledania—she encourages his emotional growth while distancing herself from the consequences among his peers.

After Claude’s suicide, partly stemming from Marion’s rejection, Sara confronts the affair’s unsustainability. She ends it decisively, prioritizing her return to Paris with Count Cluny over Marion’s devastation. Her departure coincides with the dissolution of Marion’s friend group and his near-fatal injury. In her final scenes, she acknowledges Ledania’s unresolved feelings for Marion, hinting at nuanced understanding of the emotional damage left behind. Her storyline concludes without exploration of her future or inner reflections post-separation.

Sara functions primarily as a narrative catalyst, exposing adolescent identity and relationship fragility among central characters. She embodies a "darker feminine" archetype through maturity, sensuality, and connection to adult complexities, contrasting with Ledania’s innocence. Her role remains confined to the summer at the French academy, without expanded backstory or continuation in other media.