近未来,日本政要为了推进社会的发展,宣布正式开启提升智能机器人研究水平的“ARK计划”。秉承着一颗正直之心的光明寺信彦博士(长岛一茂 饰)参与其中,谁知相关负责人竟然假借“ARK计划”名义意图开发军用机器人。在此之后,光明寺博士不明不白死于事故,身后留下了正上大学的女儿美津(佐津川爱美 饰)以及还未成年的儿子小胜(池田悠斗 饰)。某个夜晚,姐弟俩遭遇一伙不明身份之人的劫持,危机时刻一名神秘男子出手相助,随后该男子竟然现出战斗机器人的模样,他就是光明寺博士生前专门安装了良心回路的智能机器人次郎(入江甚仪 饰)。 光明寺姐弟的命运由此和次郎搅到一起,而更大的危机和阴谋正向他们逼近……Komyoji Nobuhiko is a genius and leader in robotics who is running the so-called ARK project. He is the father and creator for the embodied artificial intelligence Kikaider. However, he dies under mysterious circumstances and Kikaider turns on the project, which he believes has gone rogue and not serving its original intentions.