The drama of Kikaider continues to unfold as Mitsuko learns the truth about her parents and their relationship with Professor Gill. To protect her younger brother Masaru from getting hurt by the news, Mitsuko leaves him behind and sets off on a journey with Jiro to search for her mother. But when the truth finally does come out, Mitsuko will have to bravely face up to a tragic reality while Jiro's conscience circuit begins its new stage of development.