Legend of Regios was originally the English speaking cut-scenes on TV, that the characters in the Chrome Shelled Regios series were watching. 
This special (which has been included with the DVD release of Chrome Shelled Regios) has reorganized the scenes, extended some, and has been re-dubbed completely in Japanese. It's a side story within the Chrome Shelled Regios series.

In a post-apocalyptic world overrun with mutated beasts called Limbeekoon or Filth Monsters, humanity is forced to live in large mobile cities called Regios and learn to use special weapons called Dite, by harnessing the power of Kei to defend themselves. In the Academy City of Zuellni, Layfon Alseif is hoping to start a new life and forget his past. However, his past has caught the attention of Karian Loss, the manipulative Student Council President and Nina Antalk, a Military Arts student and Captain of the 17th Military Arts Platoon, who instantly recognizes his abilities and decides he&rsquo;s the perfect candidate to join her group. However, with a secret past that won&rsquo;t leave him alone and unknown powers beyond normal, Layfon just might not take it.

A series set in the past world of Chrome Shelled Regios. 
Failed on the development of space shuttles to let human go to space, wars arise everywhere on earth for the already running out materials, foods, and resources. In all of those riots, a research team "Alchemist" continues on developing a Subspace Creator System (Aurora Field). 
Hundred of years pasts since then, Aurora walls are limiting the world people can go and nobody knows what lies behind those walls. And a research on "the other side" is begun, their purpose is to examine the forgotten world behind the aurora field. Ailen is one of the research members and he is the only one that came back from the mission, along with his already "affected" body... 
The madness of "Alchemist" started to break the world peace inside the walls, and to keep on living Ailen rose against them...

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