In the mid‑21st century, humanity has launched space exploration, and Planet Catcher Corporation pioneered seizing asteroids and comets to harvest their resources for Earth. On one such asteroid, Tortatis, 12‑year‑old Nanbu Ushiwaka – the first child born and survived in space – resides.
Yet safety is no longer assured; a military satellite sparks disaster during the capture of Halley's Comet, leaving Ushiwaka and his fellow colonists to survive while both their nation and company abandon them. The colony, built for long‑term habitation, now faces imminent collapse as critical systems fail. With supplies rescue, children must rely on ingenuity to keep hope. Will they escape before the asteroid"s nuclear reactor melts? Or will they perish, as they did, among the stars?