Sandra Asagiri, known as Rei Asagiri in the original series, is recontextualized in the European Spanish dub as a figure shaped by profound abandonment. Raised without parental guidance after her mother’s desertion, she harbors deep-seated distrust and unresolved emotional wounds. Her paternal lineage—initially a mystery—is later unveiled as Kosuke Tamura, the protagonist’s uncle, irrevocably entangling her in the story’s core tensions.

Emerging as a rival, Sandra embodies aloofness and fierce competitiveness, fueled by envy toward those she perceives as advantaged. Her early hostility manifests in sharp verbal exchanges and physical clashes, externalizing her internal battles with trauma. This adversarial stance gradually softens through shared trials in the music industry, paving a path to mutual respect with the protagonist.

Her journey navigates confronting her mother’s abandonment, acknowledging her kinship with Kosuke, and redefining her identity. A defining act of shielding the protagonist from harm catalyzes her empathetic growth, while later moments expose her vulnerability—public regrets, earnest efforts to forge meaningful connections—underscoring her transformation from isolated antagonist to complex ally.