Machine Island, an island isolated from most of the world has been torn asunder by a conflict between 3 factions vying for control. There are plentiful resources on the island enabling each faction to build a near limitless supply of robots to have at their disposal. The worldwide government has sealed the island with a Gravity Curtain where only their government-issued machinery can freely enter and leave the island. Each faction controls one portion of the curtain and the island's conflict has escalated to the point where the massive tension and destruction will eventually cause the Gravity Curtain to collapse within itself and destroy the planet . The government sends out the 2 member Death Caprice Squad: Ken Kaido and Ryo Magami - the pilots of the Mazinkaiser SKL, to neutralize the curtain and end the dispute once and for all.
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! ??
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.