I know that DNA determines my looks and thoughts. But I don't know if DNA can determine the relationship between me and you. I love you, or do I hate you? Are we lovers or strangers? He has always believed that feelings will only make things full of variables and cannot solve any problems. Only calm reasoning can make the world have a reasonable order. But the tower that he built with rationality was pushed into the girl wearing a white dress. If he doesn't know her, what is the familiarity when she appeared? If he advocates reason, what is the sensation when she disappears? No crime has escaped the monitoring of the DNA Reconnaissance System, and the scientist Shen Le Longping is convinced. He did not bother to use the system to find the murderer again and again, and successfully solved the case. And his ultimate goal is to bring the DNA materials of all Japanese nationals into the system, so that all crimes are invisible. However, the developers of the system were killed when the dream was about to be realized. Kagura collects suspicious hair left on the scene and compares it with the "perfect" detection system in his heart. I didn't expect the name of the murderer on the screen to be - Kagura Ryuhei!