Tina Hurst, born to researchers pioneering experimental masks, owes her survival to a prototype fused to her body moments after birth. Her mother, Julia Herst, absorbed lethal radiation during pregnancy in the catastrophic "mask accident," prompting father William Herst to bind the experimental device to Tina. This integration neutralized the radiation’s fatal consequences, granting her immunity to standard mask-user degeneration and paradoxical immortality paired with natural aging.

Her hybrid nature positions her at the epicenter of a global struggle over mask technology. Determined researcher Geffrey Connor relentlessly pursues her unique prototype, intensifying his efforts after she inexplicably survives a fatal crash—a stark demonstration of her mask’s life-sustaining power. Disconnecting it would unleash residual accident energy, ending her life instantly.

An enigmatic figure dubbed "The Professor" emerges as both her grandfather and the disgraced architect of the original mask project. Having once condemned the technology as monstrous, he defies his principles to covertly supply Tina with a second mask when Connor extracts the first, enabling her continued survival.

Detective James Blood forms a fiercely protective alliance with Tina, their bond forged through shared peril as they evade Connor’s forces. Clues about her mother surface through Anna Winehouse, a pharmaceutical magnate with ties to Julia’s research, contrasting her father’s silence on the subject.

Decades later, Tina dedicates herself to scientific inquiry, driven to decode the mask technology intertwined with her identity. Her enduring partnership with James underscores her tenacity amid lingering ethical debates over the masks’ legacy. The spin-off *Hero Mask: A lost memory* expands her narrative within the anime’s canonical framework.