Noir has just fulfilled a contract to kill a revolutionary leader, but Kirika is shot herself whilst making the hit. With the remaining revolutionaries hot on Noir's trail and out for revenge, Mireille realises that her only chance of escaping may be to relieve herself of the burden of her injured partner.

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?