Carmen initially forms a romantic connection with professional cyclist Pepe Benengeli before marrying his older brother, Ángel. Her relationship shifts during Pepe’s military service, as she and Ángel grow closer in his absence. This decision fuels Pepe’s enduring resentment, though Carmen’s personal viewpoint remains unexplored within the narrative framework.

Her marriage to Ángel unfolds alongside the Vuelta a España’s pivotal stage, which traverses their Andalusian hometown. The wedding festivities feature traditional elements, including Carmen’s flamenco performance at the reception, blending local culture with personal celebration. Meanwhile, Pepe’s concurrent participation in the race weaves a parallel thread of professional ambition and private strife, though Carmen’s direct influence on these events remains tangential.

Carmen’s history prior to her ties with the Benengeli brothers and her motivations for choosing Ángel are not elaborated. Her narrative function centers on sparking Pepe’s internal turmoil, underscoring familial discord and unresolved rivalries. Following the wedding, interactions between Carmen and Pepe are sparse, devoid of overt resolution or confrontation.

Carmen remains absent from ancillary media, including the sequel *Nasu: A Migratory Bird with Suitcase*, and receives no expanded backstory in the original *Nasu* manga by Iou Kuroda, leaving her character arc anchored to the initial portrayal.