On the surface, Jiro appears to be a normal teenage boy &mdash; he's riddled with self-doubt, has trouble making friends, and owns a guitar he doesn't know how to play. But he's really Kikaider, a super-powered android with a secret "Gemini" device implanted in his brain to help simulate human qualities. Professor Gill, a former associate of Kikaider's creator, is hunting for the Gemini device&hellip; and he'll go to any lengths to recover it! 
(Source: CMX)

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)

An alternate sequel to Kikaider: Code 02. The manga was based on Inazuman chapter "The Boy with the Guitar" and follows mainly Inazuman's story.

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