Noir features two female protagonists, Mireille Bouquet and Kirika Yuumura. Kirika is also known as "Crow" due to her black attire and dark demeanor.
However, to help me pinpoint the exact anime you're thinking of, please provide more details:
* Is the boy the main character?
* What is the genre of the anime? (Action, comedy, romance, etc.)
* What is the setting of the anime? (Modern world, fantasy world, etc.)
* Any other characters or plot details you can remember?
The more information you give me, the better I can help you find the anime you're looking for.