Genius robotics Professor Komyoji is killed in his lab, when attacked by various androids from Professor Gill's DARK organization. He has however succeeded in creating Jiro, a super-android who looks like a human - until he morphs into his battle form, Kikaider. Jiro is tasked with the protection of Dr. Komyoji's son and daughter. What sets Jiro apart is the 'Gemini Circuit' or 'Conscience Circuit', that allows him to feel emotions, and have a sense to distinguish wrong from right. Jiro meets Komyoji's daughter Mitsuko and son Masaru, who initially welcome him. However when Mitsuko checks her father's data, she learns that the Gemini Circuit is flawed. Should this circuit malfunction, Jiro will need to be destroyed because of the danger he presents with his incredible powers. Jiro flees, but finds himself battling the insect-like mecha sent by the evil Dr. Gill. An extremely important point to the series takes place when Jiro overhears a man playing a guitar and asks to learn how to play. He learns with little difficulty prompting the man not to be amazed, but frightened. Two things grow from this - Jiro's attachment to the guitar, and fear of alienation and discrimination and so his desire to become real instead of humanoid, the so-called Pinocchio element of the series.