After War 0024. It’s been twenty four years since a devastating war changed the Earth’s environment and nine years since the destruction of the newtype known as D.O.M.E.

During a contest to win rights to salvage and perform shows in the Sea of Lorelei, Rick Aller rescues Rosa the Second (Rosa II) when her mercenary crew turns on her. With her mobile suit damaged, and his own small mobile armor damaged as well, they hide inside a sunken submarine that has been resting on the ocean floor since the 7th Space War. While investigating the ship they discover a black GX-9900 Gundam X and decide to use the mobile suit to escape in. But when they open the cockpit they discover the pilot of the mobile suit is still inside of it and in a state of suspended animation…