New City is one of the most technologically advanced and progressive cities in the world. Here, robots have already become everyday life, skyscrapers reach to the skies, and residents move around in flying cars and replace their body parts with cyber implants. Four young people are sent to an internship in the detective bureau of the police department in order to get their dream job and fight crime. Become real detectives. And it was at this time that a series of murders of girls occurred in the city. The criminal leaves no traces, and a black rose flower is always found on the bodies of the victims.