Sakia Lumei is the true form of Saki's body and Saki is actually an alternate personality.
As the persona that protects over Saki, she is charged with keeping Saki from Clustania hands. The original personality developed by Archia, Sakia works against the group and sides with Archia in the beginning. However, after the events of Arphage, she changes her mind and helps Aoto save Saki.
