By 2167, mankind has colonized and is living even on Mars, but the people living in such a remote area are contemptuously called Martians. Radium, who had been demoted to a particularly remote area of Mars, was given a mission to operate and pilot a secretly developed humanoid weapon called Orbital Frame IDOLO. But the army from Earth kidnapped Dr. Rachel to seize the Orbital Frame’s secrets and Radium’s girlfriend Dolores also became involved.