Florian Rochefort is the heir to a once-wealthy aristocratic family that has fallen on hard times. One way to save the family's fortune would be to sell the Flame of Mughal, a 120 carat diamond that has been entrusted to the Rochefort family, but Florian's mother refuses to part with the treasure.
A distant relative, Ray Balzac Courland, shows up at a Rochefort family party, and becomes intrigued by Florian and his beautiful "amethyst" eyes. Ray offers to pay off the Rochefort debt in exchange for ownership of Florian, and much to Florian's dismay, his mother agrees. Florian's new life as Ray's property immediately gets chaotic as he discovers that Ray is actually the famous phantom thief, Noir, who has been haunting Paris!
Story and art by You Higuri.