Mighty Space Miners OVA

Humanity started exploring space in the middle of the twenty-first century, and one business, Planet Catcher Corporation, pioneered the practice of catching asteroids and comets in order to exploit their resources for use on Earth. Nanbu Ushiwaka, 12, resides on one of these asteroids called Tortatis. She is the first child to have ever been born in space and survived. A military satellite causes a catastrophe during an expedition to catch Halley's Comet, and Ushiwaka and his fellow colonists must find a means to survive when both their nation and their company forsake them. However, survival itself is no longer guaranteed. Can they get away before the asteroid's nuclear reactor boils down? Or will they pass away in the same way they lived—among the stars?