Hinako is a rookie detective assigned to the First Investigation Division of the Criminal Investigation Bureau. She is selected for her astounding memory to investigate a crime scene, where she found the body of a suspect in an unsolved murder case.
Based on the conditions on the scene, the man’s death was ruled a suicide. But the man’s death was so grisly, he couldn't possibly have done it himself. Not only that, he died in the same way as the case he was a suspect in! Was this really a suicide? Or was it something else...? Supported by her reliable senior detectives, a gentle profiler, and a medical examiner known as “The Reaper”, Hinako investigates a series of inexplicable atypical crimes. As she carries “darkness” in her heart, and interest in the psychology of murderers, her destiny leads her to encounter a variety of criminals!