Naka Juzo is a man who continues to kill in order to satisfy his uncontrollable desire to kill. However, one day he gets involved with a mysterious organization and is tortured to death. However, when he wakes up, he finds himself reincarnated in the body of a high school girl! She looks like a busty high school girl, but inside she's a serial killer! Even though her gender has changed, her mind remains the same! So, he decides to break his murder record! JUST DO KILL!