Najica Hiiragi is a noted perfumer for CRI Cosmetics, famous for being able to identify over 500 scents. As the series began, she is struggling to finish "The Day Series" (a series of scents modeled after the days of the week), trying to find the perfect scent for the final perfume, "Sunday". Secretly however, Najica is actually a field agent for CRI's Intelligence Bureau, an agency unknown to the public (and even to most of its own employees for the sake of their own protection). She is an expert markswoman with her preferred weapon; the Stechkin APS, an old Russian firearm with selective fire (auto and semi-auto) and a wooden holster that doubles as a shoulder stock. The twenty round magazine is loaded with non-lethal plastic bullets.