Marín, son of the chief scientist on the subterranean techno-society of S-1, flees his homeworld after military dictator Zeo Gattler assassinates the emperor, frames the scientific council for the murder, and obliterates their environmental restoration research. Caught in the hyperspace wake of the fortress Algol during Gattler’s coup, he crash-lands on 22nd-century Earth. Witnessing Gattler’s Aldebaran Army annihilate a Martian colony, he joins Earth’s defense force Blue Fixer, piloting the Pulsaburn—a spacecraft that merges with Earth’s Baldiprize and Cataranger to form the combat mecha Baldios. Though initially fueled by vengeance for his father’s ruin, Marín shifts focus to shielding Earth from Gattler’s onslaught.

His fraught dynamic with Aphrodia, Gattler’s lieutenant, pivots when he kills her brother Miran—the agent behind his father’s death. Aphrodia, groomed by Gattler after her parents’ assassination, begins doubting her allegiance as their clashes unveil shared grievances. Her defection culminates in a sacrificial act during the final battle, dying in Marín’s arms as their adversarial bond fractures into uneasy solidarity.

Unbeknownst to Marín, S-1 is Earth’s future, ravaged by a time loop triggered by Gattler’s artificial suns. The environmental collapse forcing S-1 underground stems paradoxically from Marín’s own efforts to thwart Gattler on 22nd-century Earth. This revelation surfaces in the narrative’s climax, as Marín grapples with the loop’s inevitability while striving to alter its trajectory.

The film adaptation diverges in its finale: Marín and Blue Fixer secure fragile hope, with humanity sheltering underground to rebuild. The series concludes more bleakly, Earth drowned by tsunamis from Gattler’s artificial suns, millions perishing. Across both versions, Marín’s journey arcs from vengeful isolation to custodianship over intertwined planetary fates, his actions sealing the loop yet underscoring the cyclical toll of ecological ruin and militarism.