Origin
Japan
Kirika Yuumura is an assassin who worked with Mireille Bouquet under the codename Noir. Much about her past is mysterious, even to her; she experienced severe retrograde amnesia almost immediately prior to meeting Mireille, and since then has recovered only fragmentary memories. Despite her young age, memory loss, and a certain naiveté, Kirika possessed the skills of a superbly-trained killer. Her preferred weapon is a Beretta M1934 pistol, although she was also an expert at killing people with whatever was at hand

Noir
"Make a pilgrimage for the past with me." It is these words, together with a haunting melody from her past, that draw professional assassin Mireille Bouquet into a partnership with Japanese schoolgirl Kirika Yumura, an amnesiac whose instinctive killing skills match Mireille's own abilities. Pursued by relentless and vigilant foes, Kirika and Mireille form a partnership code-named Noir, and begin a quest to discover the truths of their pasts, truths that could lead to their deaths.