This episode begins in flashback, with Kotona as a child, being attacked and thrown into a large pool of water, where she fell into her Zoid, the Rainbow Jerk. It is revealed that the place she was fleeing was Iron Rock, her home. Back with Ruuji, Ron, Mii and Yakku, Mii sleeps to heal from her injuries sustained in the previous episode, while Ron explains that Digald probably has a Zoid factory, due to their constant deployment of new units like the Volcano. This surprises Ruuji, who, like Rei Mii, thought they were simply dug up.