Manabu Karui, a 12-year-old Earthling orphaned by the Zaal Empire’s invasion, survives the conflict’s devastation by joining a band of children sheltering in the *Adalus*—a retrofitted spaceship turned rebel base. His innate technical prowess propels him into maintaining the base’s systems and crafting weapons, tasks that steadily earn the guarded trust of Dr. Earl, a Heliosian scientist initially wary of his youth and human origins. As Manabu masters alien machinery, he shoulders critical technological duties, proving indispensable to the base’s operations.

His ingenuity shines through ambitious feats: reconstructing a collapsed city using scavenged materials and engineering salvaged tech into *Gamelot*, a battle-ready vehicle operated alongside younger orphans Ochame and Jiro. Beyond combat, he strategizes supply routes and infrastructure repairs, channeling his scrappy street-urchin instincts into methodical efforts to rebuild Earth. Though his past before the invasion remains unspoken, his evolution from a lone survivor to a pillar of the group mirrors the resilience of his fellow orphans.

Manabu’s journey—marked by escalating responsibilities, from repairing machinery to coordinating reconstruction—embodies the latent potential of youth in a fractured world, blending survivalist grit with unyielding hope.