Jane, known as Nozomi Mine in her original context, enters life entangled in a nurse’s vengeful scheme, swapped at birth from the affluent Koda family to the impoverished Mines. Raised amidst hardship, she shoulders familial burdens early—laboring at her adoptive family’s food stall and taking odd jobs. When her adoptive father’s illness strains their finances, she channels their shared passion for music into a career to save him, forging a bond deepened by mutual devotion. His death shatters her, amplified by the revelation of their lack of blood ties, yet she defiantly clings to the Mines as her true family.

Enrollment at an elite school, secretly arranged by the vengeful nurse, exposes Jane to Miki Koda’s cruelty—a rival weaponizing class privilege to humiliate her through sabotaged performances, public shaming, and fabricated theft accusations. The nurse’s manipulations fuel these clashes, aiming to fracture both families. Amidst this turmoil, Jane navigates a complex romance with Fanny, her adoptive brother, initially misled into believing they share blood. Clarifying their ties deepens their connection until tragedy strikes: in the manga, Fanny succumbs to tetanus after the nurse orchestrates a car crash, while the anime spares him, preserving their relationship.

Unraveling the infant swap forces both families into reckoning. The Kodas grapple with guilt over their past hostility, while the Mines’ matriarch remains Jane’s unwavering anchor. Resolution emerges through mutual acceptance—the Kodas claim her as biological kin, the Mines reaffirm parental ties—bridging the feud. Jane’s journey weaves resilience against class prejudice, commitment to artistic integrity over commercial gain, and family redefined by loyalty, not lineage. Her musical triumph, forged through adversity, becomes the catalyst uniting her fractured worlds, cementing her legacy as both Mine and Koda.