fter a drawn-out, viciously-fought war, the earth has been conquered by the alien Illumidus Empire. Harlock, a captain in earth's fleet, crashes his ship to prevent the Illumidus from using it, and flat-out refuses to join them. With the help of his allies, Tochiro and the space pirate Emereldas, and his lover Miya, he wages a private and bitter war against the Illumidus.

Overview from themoviedb.org