During the late Edo period in an alternate Japan, a crisis unfolds with the arrival of foreign Black Ships. However, a colossal ancient robot known as Onigami intervenes, driving away the foreign vessels and maintaining Japan's isolation from outsiders. Set in a timeline where the Meiji Restoration never occurs in 1868, the narrative kicks off in a reclusive Japan. The tale revolves around the theme embodied in the tagline, 'I have the potential to become the most extraordinary individual worldwide, for I remain untainted by physical intimacy!'