Reiko Hibiki, a descendant of the ancient Mu civilization, wields psychic abilities tied to the Star of Ra Mu—a crystalline artifact crucial to empowering the guardian robot Raideen. Her bloodline binds her to the machine’s mystical origins, as only her psychic strength can unleash the Star’s full power, though activating it consumes her life force, culminating in her sacrificial death. Her body is later spirited away aboard a Mu vessel, hinting at resurrection or a return to her ancestral realm.

Pursued by the Demon Empire for her knowledge of Mutronium, Raideen’s self-repairing armor material, Reiko is captured, petrified, and subjected to interrogation during fleeting moments of revived consciousness. Her imprisonment fuels recurring conflicts as enemies seek to exploit her connection to Raideen’s technology and Mu’s hidden legacy.

Her past unveils a marriage into the Hibiki family, merging her Mu ancestry with Akira’s human lineage to fulfill a prophecy demanding a pilot of dual heritage to command Raideen. Beyond maternal ties, her choices and captivity steer the war’s tide, shaping clashes against Emperor Barao’s resurgent forces and the empire’s schemes to plunder Mu’s secrets.

Her journey orbits around sacrificial acts, ancestral legacy, and the ripples of her imprisonment across the conflict’s expanse, anchoring her role in the struggle against the Demon Empire’s ambitions.