Mireille Bouquet is a professional assassin, and an extremely good one at the moment. But if she follows an E-mail from a new Japanese girl named Kirika Yumura, inviting her to shoot"a pilgrimage to the last"her life gets even more threatening than it already is. But with a haunting melody invoking the memory of an event long past, Mireille and Kirika opt to work together to get the facts simply because before they were born, in regards to a thousand-year-old organization that's controlled their lives. And the hint in their search, the single thing Kirika recalls about himself, becomes their working code name: a name designating an fate, of 2 maidens who reign over death--Noir.