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A cargo ship that follows a storm. The Marine Corps' elite Glen Falcon corps is trying to prevent the collapse of the gravity furnace in order to save the world from destruction. However, Kikaijima, where the gravity furnace is located, has become a lawless zone just like in the Warring States period, where men drive giant robots to compete for victory. Lieutenant Yuki, the survivor of the unit, sees a genie there who turns everything into an enemy and does his best to destroy it.

After stopping the remote control device at Kiva's fort, Yuki heads for Hachiryokaku and encounters a total attack by the Galan army. At that time, Kaido and directly above were hitting Galan Castle one step ahead. Knowing that Kaiser's rescue cannot be expected in the battle of Shiryokaku, Yuki makes a certain decision. On the other hand, the sea roads of Galan Castle shift to a robot battle with Galan. However, Mazinkaiser is in danger of desperation when he buys a maneuver and falls into a mysterious frenzy in the battle !!

Shiryokaku is forced to struggle before the great offensive of the Galan army. In that moment, a new machine god descends from the sky! Gravitational collapse finally begins on the battlefield, which seems to have regained balance due to unexpected reinforcements. There are only a few time limits left. The sea movement is directly above, and can our Mazinkaizer SKL (skull) crush this unprecedented crisis! ??