Due to a back injury, Hiroshi developed a slipped disk which led him to a mysterious beauty salon. There, he was given a free trial for beauty treatments and a massage by an unexpected, beautiful girl. Upon returning home, Hiroshi was shocked to discover he had been turned into a robot. While his son Shinnosuke was thrilled about the situation, his wife Misae was deeply concerned. However, the robot version of Hiroshi proved to be highly useful as he could perform an array of tasks including cooking and cleaning when controlled by a remote. As Hiroshi attempts to uncover the reason behind his transformation, he discovers that it was part of a dark conspiracy by "Chichi Yure Doumei (The Association of Fathers)" to create a robust father figure for all fathers in Japan. However, the scheme spirals out of control, causing chaos across the nation and leading to the downfall of the Nohara family and Kasukabe. In an epic battle of middle-aged men, Shinnosuke and Robot Dad come to the rescue, saving the day and bringing a touching story that moves all fathers and families in Japan to tears.