A skilled model builder, Aoba is a youthful enthusiast of robots. For a while, she lived under the roof of her grandmother alone, but the latter eventually passed away. However, Aoba's fate changes drastically as she gets abducted and taken to a covert facility, where she comes across a colossal robot. Although this robot competes against the powerful Ancient-Jinki in The Grand Savanna, the underlying purpose of these confrontations remains shrouded in mystery. Aiming to unravel the enigma, Aoba labors away at the base, with the aspiration of someday piloting one of these robots.