After saving the world from collapsing, the two Ace Detectives and their assistant, Kimihiko Kimizuka, are immediately thrust into the next crisis: the Tuner Hunt. But when the likely culprit surfaces, it turns out to be the most unforgettable girl of all! Meanwhile, a client visits the Shirogane Detective Agency claiming to have been reunited with Kimihiko’s teacher—a man who supposedly died eight years ago. What is real and what is fake? What’s true and what’s a lie? Within four locked rooms, Kimihiko is forced to ask himself what he wishes for and who he really is—questions no one can run from.