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