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(Synopsis) In 192 U.C.(United Century), mankinds are facing its very end. Orbital Ring System (ORS), the giant space base built around the orbit of Earth for space exploration, is captured by the unknown extra-terrestrial lifeform, "Radamu." Despite of several attempts to re-captured the ORS, all failed.

Mankind is virtually unable to defend themselves from the constant attacks by Radamu. Cities are destroyed, the Earth is doomed. Instead of destroying Earth completely, Radamu invades Earth by growing "plants" all over the surface of Earth, guard by powerful cyborgs known as "Tekkaman."

But the war is not over. Tekkaman Blade is fighting for Earth. Discovered by Aki and Noel, the members from Outer Space Agency. To their surprise, this mysterious warrior, fallen off from ORS, is actually a human being. Without any memory of himself, he is given the nickname "D-Boy" (Dangerous Boy).

With his Radamu crystal, D-Boy can "transform" into Tekkaman Blade with unprecedented power. So why does this Tekkaman willing to fight against Radamu to save the mankinds?!