The 16-year-old Kurenai Shinkurou is a mediator — a specialist in settling squabbles between people. Despite his youth and easy-going nature, he is a man of some skills when it comes to protecting both his clients and his client's interests. One day he is assigned as a bodyguard for Kuhouin Murasaki, a seven-year-old girl.

From how the girl reacts to everyday events, like shopping, it is quite clear to Shinkurou that she must come from a wealthy background, and as it turns out Murasaki's family is very powerful and dangerous...