She's a former slave who ran away with her older sister. Maoyuu's head maid take her and her older sister to become maids.
Little Sister Maid is originally created by Mamare Touno and illustrated by Keinojou Mizutama & toi8 for the Maoyu light novel series. There is no current information regarding any inspirations used to create this character. She is illustrated by Hiro Touge in Maoyū Maō Yūsha: Oka no Mukō e manga series, by Akira Ishida in Maoyū Maō Yūsha: "Kono Watashi no Mono to Nare, Yūsha yo" "Kotowaru!" manga series, and by Hiroaki Karasu & Masashi Kudo in the anime series. She first appears in episode 2. She is voiced by Nao Toyama.