A mysterious assassin known only as "Codename D" operates at the highest level of the profession, whilst their true identity, age, and nationality remain unknown. While rumours paint D as male, the truth is far different - D is actually a highly skilled woman. Taking contracts from both corporations and private clients, she executes each mission exactly as specified, whether it requires precision marksmanship, hand-to-hand combat, or covert infiltration. This is the story of D, the ice-cold professional who never fails a mission - a lethal beauty who brings perfection to the art of assassination.