Debutante Detective Corps begins with introductions to the five main characters, Miyuki, Reika, Youko, Nina, and Kimiko. It seems these five girls are incredibly rich and have been sent a threatening video tape by forces unknown. A police guard is set up at the school where the girls have enrolled. Kimiko, however, doesn't like the idea of being cooped up at school, and convinces the rest of the girls to trick the police into leaving. No sooner are the police gone, however, then the girls are assaulted by three armed terrorists. What ensues is a rather silly escapade with our heroines attempting to thwart their attackers.

Music Video of the single A song for You! You? You!! from μ's.

Sonnet is a cyborg/esper from a harsh background and now trained to be the ultimate warrior and most powerful weapon in the world. She is sent to Japan to watch Komatsuzaki Lan, who is thought to be controlled by the rage of the esper Akai Kiba (Crimson Fang). Lan is a quiet girl who knows she's different from everybody else and starts to show signs of Crimson Fang after coming into contact with Sonnet. In the course of fighting with Lan, Sonnet starts to rediscover her humanity. At the same time Lan has to fight to retain her humanity and control the Crimson Fang.