Hebe Tien looks and acts like an average girl. She was pretty. She was smart. She was popular. And she was sweet. But underneath the mask is a serial killer unlike any other. She was Devil. The top assassin in the world. The only clue about Devil was that she was stunning. Everyone knew that Devil killed mercilessly. She had a heart of ice, killing anyone who got in her way. She never failed a mission. What happens when Devil’s next mission is to kill the school’s top nerd?