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)

Hatsuki is a highschool student living with her sister, Hatsumi, who she has a huge crush on. On Hatsumi's 16th birthday, she is suddenly surrounded by a green light and disappears in front of Hatsuki. She manages to follow Hatsumi with the help of a being resembling a fat baby chick (literally), ending up in a place called "The Great Library", which is full of different worlds stored in books. Hatsumi wasn't there, though, so the search for Hatsuki's great love begins and involves traveling from book to book.

She works for Group Komadori. Her debut animation was "Ginga Hyouryu BYFAM".