Set aboard the Asterism, a cruiser powered by super-gravity, this twelve-episode sci-fi ONA centers on the ship's captain. Working with a vice captain and a group called the Hoshimusu, or Starly Girls, the captain directs the G Gear, short for Gravity Gear, a special mobile weapon. Their shared goal is to stand against the fate of the universe and make the stars shine again, setting up a space adventure built around action.