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Noir is the French word for "black". In Noir, it is known as the name of the two maidens who govern death. Pictures and sculptures of the two maidens can be seen on Mireille's father's watch and on Soldats' churches. To the underworld, it is known as the "One Thousand Year" darkness of Europe. According to Altena's story, when the Soldats went under, two hands were left on the surface, so their ancient task is to retrieve the two maidens known as "Noir". The ritual to become Noir takes place under Altena's manor, an underground temple in the style of ancient Greek ruins.
Throughout the series, the only three candidates for "Noir" are Mireille Bouquet, Kirika Yuumura and Chloe. Of all the three, Mireille was the only who was predicted to be neglected, and Kirika probably is the only who can turn into True Noir. When one has fallen, the remaining two shall become Noir.