In Japan, a bright light blasted up from the ground, people argued what it was, a little girl named Miya is the only one who knows the truth about the light. Now, ten years later, robots have showed up and started destroying the Earth, these robots are called the EX Tartaro. But a good team of robots called Dangaioh want to save the earth.

A mysterious explosion on Futagami Island begins a new chapter in the Dangaioh myths. Led by the evil Professor Katou, a band of warriors calling themselves the "Tartarus Knights" have begun their campaign to lay waste to the world by way of a small research station on Futagami Island. Katou's victory seems almost certain until he encounters an advanced fortress guarding the island. From it, a group of three humanoid robots are launched-Dangaioh.—AniDB