Takes place in Kunitachi in Tokyo, where Reiko Houshou, daughter of the owner of the world-famous Houshou Group, has become a rookie detective. Her boss is Inspector Kazamatsuri, the son of the owner of Kazamatsuri Motors. The two work to solve difficult cases. When tackling her cases, Reiko always consults her butler and driver Kageyama, who spouts harsh language insulting Reiko but always brilliantly manages to solve the case.