It is the near future, United Space Calendar Year 192. The evil alien Radam have besieged the Earth, gaining control of the enormous Orbital Ring that surrounds the planet, and raining down mysterious spores that fill Earth with alien plants. Aki and Noal, two pilots from the Outer Space Development Group, find one of the alien lutinents who crashed landed on Earth. The stranger claims to have no memory, and is determined to fight to protect humanity! His name is D-Boy, and he appears to be a normal human, until he transforms into the bio-mechanical warrior, Tekkaman Blade!