Having asked her old friend Vanel to find information on the people who are trying to kill Noir, Mireille is shocked to discover that whatever he has uncovered has cost the lives of him and his entire family. Realising that Vanel must have been onto something important, Mireille begins her own investigation to find out the secret that cost her friend his life.

Mireille and Kirika are contacted by a man within the Soldats who is willing to give them a book containing valuable information. As the two women follow up this intriguing lead, they once again come up against the ""true Noir"", the mysterious assassin Chloe.