アクセラ

An android of the Shimazu family. She is in charge of all household chores. Accela initially was an illegal android and once experienced a fatal error during a particular incident. Hidetaka and Aki found her abandoned without a master. Afterward, they reactivated and brought her home. Later, she officially became an android of the Shimazu family under a particular condition; they would search for who was responsible for her modification. [Translated from Wikipedia]