Bachelor of Science Homura Roku was walking at night when he heard that Dr. Takeda had been killed. He rushed to the scene and found that the doctor was dead in a miserable condition and the android's fists were stained with blood. During the investigation, Mrs. Wula and Mr. Taro Majie became suspects. After returning home, the wife found the doctor dead, but chose to leave and her whereabouts were suspicious. Taro Majie was once the doctor's assistant. Due to his love for his wife and debt problems, he was suspected of committing the crime. The police discovered that a page was missing from the android manipulation code list, making the case even more confusing. Is the doctor's murderer an artificial human? How do artificial humans act?