After Earth Corps destroyed everything dear to them, the orphans Bao and Mao found an abandoned Variant Armour in the forest. Although they had no prior experience piloting a VA, they manage to get it moving through sheer luck. The duo soon form a friendship with Arieta and vow to help her evade the clutches of the Earth Corps laboratories that she escaped from. Later they join up with Chiyomaru and Tessan to prevent the Earth Corps from unleashing their doomsday weapon.
Together they pilot the GP-V4 VISE.