Solve this case: "Why did the detective become a noble lady?" While investigating a certain case, detective Nogami suffered a fatal injury. In the moment he thought he died, he was somehow reincarnated into another world as the daughter of an Earl, Julia Moriarty...! ​How did this happen? While grappling with this mystery, Julia uses the power of "Retrocognition" (seeing the past) to confront various incidents as a detective lady.