A story about a group of female geeks working at a police station. Saijo Yui is a forensic officer with good memory and evidence analysis skills; Kira Masumi is an industrial physician specializing in psychological analysis; and Motoyama Iori who works as a traffic officer and has very good knowledge of geography. These woman are smart but have difficulties dealing with people. Their life motto is "no overtime" but they always do their best to solve cases even by meeting during the weekends.