In Noir, Paris becomes the crossroads of two women bound by violence and memory. Mireille Bouquet, a cool-headed assassin-for-hire, receives an odd email from Kirika Yuumura, a young student from Japan, inviting her to "make a pilgrimage to the past" together. Mireille dismisses the message until it triggers a song from her youth, a detail that suggests the sender may know more about her than any stranger should.
When the two finally meet, armed men attack them, and the encounter reveals that Kirika is far more dangerous than she first appears. She fights with lethal precision, yet claims she cannot feel remorse for the people she kills and remembers almost nothing about how she learned to fight or who she truly is. Recognizing a connection they cannot yet explain, Mireille agrees to work with her, and the pair begin taking jobs as they search for answers. Under the codename "Noir," their uneasy partnership grows more fragile with each assignment, drawing them deeper into the hidden history that links their pasts and the truth behind their identities. As they continue to move through a world of secret organizations and hidden agendas, every new assignment brings them closer to the forces that have shaped them and the truth buried in their shared past.