Nana is a policewoman, she became a police officer because of her determination to reveal who the murderer was behind the death of her lover three years ago, but her mother doesn't happy with Nana's decision to join police-

Meanwhile, you are an assassin, but besides that, you opened a cafe, apart from covering your main job, you also like making coffee, tea and cakes. And one day, Nana happened to pass by your cafe, she decided to stop by and buy a cup of tea.-