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I thought it was a secret room murder, but a big hole opened in the wall. What was the murderer's purpose? A young woman was murdered in a park. Why did the "impossible" watch she was wearing stop at a strange time? The female high school student who entered the underground passage did not come out from the other side and suddenly disappeared... Six cases that left people with no clues were solved by two young detectives - Katazashi Hyōsame, who specializes in motive analysis, and Gotemba Auri, who specializes in the study of crime techniques, through seamless cooperation and tacit understanding!