Nobody knows of Nina's past, just that she was kidnapped by assassins when she was young. She trained to become an assassin with other young children, until a man called Sergay Wang came to kill the assassins. Sergay sees Nina, and decides to adopt her. Nina trains in Garderobe from then on, to become Nagi's (Sergay's master) otome. She grows to love her stepfather more than loving a father, and is jealous when she finds that Sergay loved a woman called Rena Searrs from a photo album.