The story on Arcadia's mystery, on which the 13th television episode was based.

After 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.

Space Pirate Captain Harlock and his fearless crew face off against the space invaders who seek to conquer the planet Earth.