Megumi Sato is a skilled female spy for the secret women's intelligence agency "ROSE". As a child, Megumi was a delinquent, and as an adult, she became a very scary, sadistic queen under the name "Megumi Yozakura". But one day, she suddenly decided that she wanted to change her life from bullying men to a life that would help the world and people, even if only a little, and so she changed her profession to become a female spy. Then, the greatest tragedy befalls Megumi...