In the mid‑21st century, humanity has embarked on space exploration, and Planet Catcher Corporation leads the way by capturing asteroids and comets to harvest their resources for Earth. On the asteroid Tortatis resides 12‑year‑old Nanbu Ushiwaka, the only child ever born and survived in space. Yet survival is no longer guaranteed when a military satellite causes a disaster during the operation to capture Halley’s Comet. Ushiwaka and his fellow colonists must find a way to survive after their nation and their company abandon them. Will they escape before the asteroid’s nuclear reactor melts down, or will they perish as they have lived, among the stars?