Saeko is the eldest of the Nogami sisters and a beautiful woman detective of the Tokyo police.  She is able to shoot the bull's eye out of the target board with her S&W 38 special, however, prefers the 16 throwing knifes she carries on her stocking as her weapons (but how can she manage in preventing herself from being hurt?!).
Reika is the second of the Nogami sisters and a former policewoman herself.  She quits the force to become a private detective after her partner was framed and killed by a corrupted policeman.
Yuka is the third of the Nogami sisters: High School student and very young and famous thriller writer. She takes her inspiration from her older sisters' adventures, which drives them CRAZY! So Yuka, in a lack of inspiration, grab herself to the poor Ryo to obtain a new and exciting story.