Madame Casa is the headmistress of the Elives School. She seems very kind and reasonable, and is willing to give Phayne a second chance at school there if he will explain what happened with the Tome of the Black Arts. It is very obvious that she knows the truth regarding the incident, or at least knows that Phayne is covering up for someone else, as she knows Phayne would never resort to cruel monster enhancement methods. While she waits to hear the truth, she does try to find a solution to the problem regarding IMa's training methods. After you reach Rank S, she congratulates you and later comes to your ranch in Togle for help when the Tome is stolen.
After Xevion is defeated, Madame Casa suggests recording the recent heroic acts of the Elives students in a history book called the Tome of the White Arts in case Xevion should ever try to rise again.