Spy Megumi Sato, a member of the secret female intelligence agency "ROSE." In her childhood, she lived as a delinquent, but as she grew older, she became feared as "Yozakura Megumi," a sadistic dominatrix. One day, she resolved to change her life and dedicate herself to serving society, choosing the path of a spy. However, this decision brings about the greatest tragedy she will ever face, becoming the ultimate trial in her life.