A princess in Ritsuko and Gargantua's world. One day, when she is placed under Ritsuko's care, she meets Gargantua and eventually develops a crush on him. She is later kidnapped and sacrificed to Lilith by Gargantua, committing suicide by poison, but is reincarnated and employed as a maid by Tamamonomae. Toward the end of the anime, the incarnated Mariel accepts proposal from one of Gargantua's henchmen, who falls in love with her after she tends to his injury in a gentle and caring manner unlike his neglective master.

(wikipedia)