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.

It has been a decade since Mireile was forced to flee from Corsica after the murder of her family, and she has always been too afraid to return- until now. Determined to uncover the truth about her parents' murder and its connection to the Soldats, Mireille returns to her childhood home. But as she tries to stir up information from the past, she attracts the attention of those who would rather it remained buried.

For Kirika and Mireille, the point of no return has been reached. For, as Kirika's memories come flooding back, Chloe unravels the mysteries of the past for Mireille, revealing the true identity of her parents' murderer. When they first met, Mireille promised that she would kill Kirika once they discovered the truth, but now that the time has seemingly come, will she keep her word?

Only two maidens can serve as Noir, but now that Mireille has arrived at the manor, all three candidates are present- and one must lose out. Will Chloe and Kirika pull together to remove the "outsider" from contention, or will Mireille find a way to get through to her former partner? Only a heated conflict in the manr grounds themselves can decide the answer.