[Machine Translation] One day, a woman who mistook "paper appraisal" for "divine detective" came to the paper appraisal office run by Watanabe, a man who can identify any kind of paper, and asked for an affair investigation. The only clue was a photo of a plastic model. During the investigation, he meets a legendary plastic modeling artist, Doi Doi, and arrives at a surprising truth. The next day, a woman looking for her missing sister comes to him with a diorama left behind by her sister. As he investigates, he discovers that the diorama suggests a mass murder plot. This mystery won the 18th "This Mystery is Amazing! Grand Prize and the Grand Prize winner of the 18th "This Mystery is Amazing!