3 years ago, a university student named Shiori took care of a knight who was strangely transported to Japan. Although he managed to return to his world, but this time, for some reason it was Shiori’s turn to appear in an unfamiliar world. With no one to rely on, Shiori meant to meet with the knight, but in this world, he had become a hero…

The story begins when Kanemaki, the lieutenant of a police's detective bureau, arrests the neuroscientist Kaminomiya on suspicion of murdering a serial killer known as "The Photographer." Kaminomiya confesses that he has "created many murderers." In exchange for his confession, he bargains with the police to launch a new investigation into the case of his son and death-row criminal Kaminomiya Seigi, founder of a cult that plotted to overthrow the government.