Ever since the fall of the DARK organization, Jiro has been wandering everywhere and wondering if he would ever see Mitsuko again or not. During his journey Jiro meets a beautiful girl named Rieko who is protecting Akira, a little boy from the evil Professor Gill. Ironicly, he's the son of Professor Gill, but he is also the key to Gill&rsquo;s menacing secret weapon and his plans to conquer the world.
 
(Source: Anime News Network)

The genius robotics professor, Dr. Komyoji has created Jiro (who has the ability to transform into Kikaider) &ndash; a humanoid robot tasked with the protection of Dr. Komyoji&rsquo;s son, Masaru, and daughter, Mitsuko. Gifted with a conscience circuit, which has the power to simulate real emotions that helps to distinguish between &ldquo;right and wrong&rdquo;, Jiro must protect Mitsuko and Masaru from the evil Dr. Gil who wants Jiro to join his army and aid in his goal of world domination.
 
(Source: Anime News Network)
 
The series is initially a darker version of the original live action tokusatsu show Jinzou Ningen Kikaida, creating or expanding many emotional conflicts within Kikaida and other characters which was not present in the original Kikaida story.

Dr. Komyogi is an expert in robotics and has a wealthy sponsor, Herbert Gill. Gill however, is a horrible man who forces Dr. Komyogi to develop numerous robots which he plans to use to take over the world. Dr. Komyogi realizes Gill's dark ambition and secretly develops a high-performance humanoid-robot called Jiro, who looks exactly like a human but transforms into a battle robot Kikaider who has his great superpower. Komyoji leaves Kikaider with his daughter Mitsuko and then disappears.
 
Finally, Gill makes his move. He unleashes a robot army named Dark to dominate and control human society. Mitsuko, reading a message left for her by her father Dr. Komyogi, persuades Jiro/Kikaider to fight off Gill's terrible robots. On that day, Jiro/Kikaider's fierce battles with Dark begin!
 
(Source: Comixology)

The OVA Special which teams the Anime version of the legendary Henshin Hero Jiro/Jinzou Ningen Kikaider with another Toei Henshin Hero Inazuman.  

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