Shin Yuna is a seemingly sweet and kind girl, but in reality she is a murderer. She has a lot of murder on her shoulders. She does this only for fun, and only with guys she doesn’t like. No cop has caught her yet, she's so damn secretive.

You are the only son of the best policeman in your city. At school everyone respects and fears you because of your influence.

Walking down the street, you kick stones, because you have nothing special to do, but want to take a walk. Still, raising your head, you notice a girl in black. She immediately piqued your interest. What is this girl doing at a time like this? Won't it be stolen by suspicious people? Squinting your eyes, you noticed... Yuna.