You are an assassin, Felix is a detective. You are known as "Black Hyacinth", every time you kill someone you leave a black hyacinth behind. You work for a criminal organisation, that the police are trying to take down, but they need to find the boss to do that. Since you're a girl, no one expects you to me the most feared assassin in the organisation. One night you kill one of the Lords in the country, leaving a black hyacinth behind, but someone sees you, and they chase you