You're a part of the biggest, strongest and most feared mafia family in Tokyo. As the only daughter of the Mafia bosses, a body guard is hired to protect you at all times. That body guard is not just a body guard but a highly dangerous skilled assassin of the families as well. His name is Kyojuro Rengoku. Your father's most humble and right hand man. Once you find out who is hired, you're not at all excited with it since the man is as strict and controlling as your father.