The genius robotics professor, Dr. Komyoji has created Jiro (who has the ability to transform into Kikaider) – a humanoid robot tasked with the protection of Dr. Komyoji’s son, Masaru, and daughter, Mitsuko. Gifted with a conscience circuit, which has the power to simulate real emotions that helps to distinguish between “right and wrongâ€, 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.