Kei, born Genki Saotome, is the youngest daughter of Dr. Saotome and sister to Michiru. Her childhood fractures when she witnesses Michiru’s death and her family’s collapse, burying these memories beneath a psychological barrier. Surviving a nuclear apocalypse triggered by the Shin Dragon’s annihilation of humanity, she is discovered in an underground refuge by Benkei Kuruma. Plagued by amnesia, she is reborn as Kei Kuruma—a name and identity modeled after a *Getter Robo Go* manga character—under Benkei’s guardianship.

Outwardly resilient and driven, Kei masks deep-seated trauma and survivor’s guilt, channeling these into her role as pilot of the Shin Getter Robo-2. Her resolve to shield others fuels her combat prowess, while her mechanical aptitude and medical knowledge, honed within Benkei’s faction, prove vital in sustaining the Shin Getter and treating wounded comrades such as Go.

Thirteen years post-catastrophe, Kei’s suppressed history erupts during encounters with Dr. Saotome and Benkei, reviving her memories as Genki and exposing her true heritage. Though initially destabilized by this revelation, she navigates the dissonance between her past and present, forging a unified identity. Her bond with Go—an artificial human crafted by her father—adds complexity, marked by unspoken tensions that linger unresolved.

Amid battles against the Invaders and the resurgent Shin Dragon, Kei dismantles her psychological constraints, evolving from a figure haunted by loss into an agent of proactive defiance. Her journey culminates in allegiance to both veteran and nascent Getter teams, bridging generations in a unified struggle for survival. This resolution underscores her transformation into a symbol of perseverance, anchored in solidarity and the relentless pursuit of hope.