Nicknamed Nia by Yoshihiko, d'Artagnan is a tall blonde woman from France who transferred to Buou Academy. She met Yoshihiko while she was doing oragami, and developed a romantic relationship with him. However, she was betrayed when Yoshihiko used her as a test subject to create Master Samurai by artificial means. Despite all of what has happened to her, she still bears feelings towards Yoshihiko, which was justified in the anime when she dies protecting Yoshihiko from some falling rubble while holding an origami of a samurai's helmet that was given to her by Yoshihiko in the past. She was later revived by Yoshihiko, having realized her true feelings, and becomes a true Master Samurai with the concentrate mark on her left hand.