Rea Masaki, an artificial human engineered on Geminar to pilot Seikijin against Gaia, was accidentally transported to Earth during a testing mishap that diverted her from her intended counterpart, Neizai. Discovered by Kiyone Masaki, she was integrated into the Masaki family, adopting Kiyone’s maternal identity after her death. Rea’s nurturing of Tenchi Masaki intertwined her own memories with his recollections of his mother, her culinary habits echoing Kiyone’s influence. Marrying Nobuyuki Masaki positioned her as stepmother to Tenchi and Tennyo. During wedding preparations, she disclosed her artificial origins and the mission compelling her to bear Kenshi—a child destined for Geminar. Programmed with a failsafe threatening her survival should she defy this duty, Rea relinquished Kenshi, triggering a collapse as suppressed fear and grief surfaced. Her legacy intertwined with Geminar through Kenshi’s exploits in *War on Geminar*, where ethereal voices—potentially hers—subtly shaped events. Meanwhile, Neizai, embittered by Rea’s accidental displacement, fused with Ulyte Mest via a Core Crystal, underscoring the fractured dynamic between their shared purpose and divergent fates. Symbolism marked Rea’s wedding, including Kiyone’s kimono, destined for Tennyo, reflecting continuity. Her bond with the Masaki family epitomized sacrifice, balancing programmed obligations against genuine affection. Kenshi’s departure catalyzed her evolution from a mission-driven construct to a being confronting raw humanity, her vulnerability laying bare the cost of duty and love.