Sabrina, known as Eriko Tamura in her original incarnation, is the only child of Luciano Tamura, chairman of a major music company, and Milena Tamura, a former celebrated singer. Raised in privilege, she displayed innate musical talent, especially in singing and piano, pursued solely for pleasure. Her warm family life included affection from her parents and household staff, plus care for her two pet dogs, Fortissimo and Pianissimo.

A devastating car accident, occurring as her parents traveled to the inauguration of her father's futuristic undersea auditorium, the Marine Live Stage, kills Luciano and leaves Milena comatose. Sabrina falls under Giorgio's guardianship, her father's close friend. However, her uncle Rolando Tamura—Luciano's half-brother—seizes control of the family assets and the music company. Rolando moves into the family home, ostensibly to care for Sabrina. His true motives involve exploiting her talent for profit, fabricating debts tied to the Marine Live Stage and her mother's medical costs to pressure her into a singing career.

Initially sheltered and fragile, Sabrina undergoes significant change. Forced into the idol industry, she endures rigorous training, public scrutiny, and Rolando's manipulation; he actively pits her against established performers like Susi. An early defining moment sees her calm a panicked audience during an earthquake at the Marine Live Stage by performing, inadvertently launching her public profile. She evolves from a tearful, compliant figure into a resilient performer confronting adversity directly. Key moments include challenging Rolando's exploitation, facing rivals like Rei Asagiri (localized as Susi), and overcoming emotional manipulation. A pivotal turning point occurs during a confrontation in New York where, after enduring repeated hostility, she snaps back, signaling newfound self-assurance.

Her personality blends innate kindness with hard-won determination. She shows compassion to fans, animals, and even rivals, once preventing a suicide attempt through song. Despite Rolando's efforts to isolate her, Sabrina retains loyalty from staff like the butler Italo and housekeeper Ines, who see through her uncle. Friendships, particularly with the rebellious motorcyclist Roberta, offer crucial emotional support.

Sabrina's journey culminates in balancing idol responsibilities with personal integrity, honoring her parents' legacy while navigating industry pressures. Her story explores grief, exploitation, and perseverance, concluding with her emergence as a self-reliant figure upholding her values.