During the Cold War, a KGB agent named Yuri Nazarov ordered the slaughter of members of an ethnic minority known as the Tashkil. Now the few surviving Tashkil have commissioned Noir to avenge those deaths by killing Nazarov. Yet these days Nazarov is a benevolent old man who has dedicated himself to helping the destitute. Can Noir bring themselves kill Nazarov given his apparent change for the better?

The mysterious Chloe has one last mission to carry out before she goes home to Altena and the manor- she has been ordered to kill an old NATO intelligence officer. As she journeys to Switzerland to carry out her task, Chloe finds that she is not the only one who has been sent to kill Reimann, and that she may have to protect him if she wants to be the one to eventually take him out.

Mireille and Kirika are offered a job in Taiwan- and their employer is none other than the Soldats. Despite the danger, Noir decide to accept, hoping that working for the Soldats will help them uncover some answers. But the assignment proves to be far from straightforward when they find themselves targeted by the Taiwanese assassin Shaoli, better known as the ""Cold-Blooded Killer…""

Kirika and Mireille's mission to destroy the Hang Yiban triad went awry when the Hang Yiban sent their own assassin- the ruthless Shaoli, to destroy Noir. Now, Mireille has been captured by the Hang Yiban, and Kirika must work with the mysterious Chloe to free her. But even if Mireille can be rescued, Noir still has the job of eliminating both the Hang Yiban leaders, and Shaoli herself…

Two maidens loyal to the Soldats, tested through trial, and appointed by ancient ritual- this is the true nature of Noir. As Altena recounts the history of the Soldats, the Council itself plots to move against her, and her idea of recreating Noir. Meanwhile, Chloe eagerly awaits as Kirika faces one last trial, hoping that the two of them will indeed prove worthy to become the next incarnation of the true Noir.