In the year 16XX the city of Mecha-Tokyo has been infested with strange and powerful yōkai! Where did they come from and why are they destroying the city? It's up to Giga, Tera and the other super robots to find out and stop them!

In the year 16XX the city of Mecha-Tokyo has been infested with strange and powerful yōkai! Where did they come from and why are they destroying the city? It's up to Giga, Tera and the other super robots to find out and stop them!