Following the sudden passing of her adored grandmother, Aoba was confined to a concealed installation where she chanced upon a titanic robot. Fuelled by her fervour for designing robotic models, Aoba made it her objective to operate one of the warriors employed in fighting the Ancient-Jinki in The Grand Savanna. Yet, she speedily became aware that there was something enigmatic about the machines and was determined to uncover the puzzle by putting in endless effort at the hub.