Nanbu Ushiwaka, a 12-year-old born and raised aboard the Tortatis asteroid mining colony orbiting Earth in 2060, holds a singular distinction as the only child to survive birth in space—a phenomenon under scientific scrutiny for its insights into human development in extraterrestrial environments. His parents, employed by the Planet Catcher Corporation, a leader in asteroid resource extraction, anchor his aspirations to become a certified space miner. With his father absent on a prolonged deep-space mission, Ushiwaka dedicates himself to grueling training exercises, determined to prove his worth.

During a routine Halley’s Comet capture operation, a rogue military satellite strikes Tortatis, crippling the colony and stranding survivors as corporate and governmental support vanishes. Ushiwaka, returning from a certification test outside the colony, discovers the wreckage and a new peril: the colony’s destabilized trajectory hurtling toward Earth. Amid chaos, he navigates mangled debris and zero-gravity zones to rally survivors, balancing crisis management with his relentless pursuit of certification.

Driven by stubborn resolve and an unyielding refusal to concede failure, Ushiwaka clashes with rival trainees and strained colony leaders, emerging as an unlikely beacon of hope. His agility in microgravity—threading collapsed corridors, salvaging critical systems—underscores his adaptability. Lingering tensions shadow his efforts: the unresolved void of his father’s absence, the ethical decay of corporate and political alliances, and the precarious race to evacuate. Though his journey remains unfinished due to the series’ cancellation, pending arcs hinted at survival gambits, evacuation trials, and the cascading fallout of abandonment.