Go Arisaka, grandson of the Ra’s original captain, inherits a legacy tied to the advanced battleship powered by enigmatic meteorite energy discovered in the 1930s. His father, presumed dead following the Ra’s WWII-era disappearance during a clash with the American submarine Liberty, resurfaces decades later commanding the reconstructed warship during a modern UN expedition probing Antarctic anomalies. Amid this mission, Go uncovers a subterranean civilization’s aggression toward humanity, colliding with his familial strife.

Annette, a spy from the underground race tasked with surveilling meteorite energy usage, defects to humanity, her bond with Go intertwining espionage, shared history, and fragile trust. Their alliance becomes pivotal as subterranean hostilities escalate. Go’s unresolved anger toward his father—rooted in abandonment and the shock of his secret command of the Ra—fuels tense confrontations that slowly evolve into reluctant collaboration during joint battles.

Transitioning from UN investigator to integral Ra crewmember, Go grapples with mastering the ship’s technology and embracing his inherited role. Interactions with Admiral Bogart and crewmates chart his integration into military strategy, balancing personal grievances with global stakes. The meteorites’ origins and their inadvertent provocation of subterranean invaders inform his tactical choices, culminating in decisive clashes against the rebuilt Liberty and subterranean armies.

Through these trials, Go bridges fractured family ties and wartime duty, his leadership cementing him as a linchpin in thwarting the dual threat. The resolution hinges on reconciling lineage with responsibility, merging personal redemption into humanity’s survival.