During the end of the Edo period, Japan faced a unique challenge with the arrival of Black Ships, foreign vessels that threatened their isolation. However, an ancient giant automaton called Onigami successfully defended against them, keeping outsiders at bay. This tale is set in an alternate Japan where the Meiji restoration never occurred. The climax suggests that an individual's virginity can improve their character and boasts, "Because I am a virgin, I have the potential to become the world's greatest individual!"